Resistance thermometers tend to be fragile and easily damaged especially when subjected to excessive vibration or shock. However, alcohol-based thermometers have limitations. liquid in glass thermometer principle and working, liquid in glass thermometer theroy hindi short, liquid in glass thermometer working principle, liquid in glass thermometers cannot be used for accurate work because, liquid in metal thermometer capillary tube made of, liquid thermometers principle of operation, liquid-in-glass minimum thermometer in measuring temperature, list and explain five types of therometer, list of five thermometric substances with a label diagram, list three disadvantages of using liquid in glass thermometer, maximum temperature can be measured by platinum tungsten thermometer, measure temprature at fixed intervals of 5 minutes by thermometer between hot water and cold water, Measurement of temperature using mercury-in-glass thermometer, measuring volume of liquid in clinical thermometer. It has large bulb size. y is mercury in glass thermometer more preferable than liquid water or liquid in glass thermometer? A platinumâplatinum/rhodium thermocouple generates an e.m.f. The cold junction is then known as the reference junction. Problems on Energy Conversion and the Second Law, The Second Law of Thermodynamics:Internal Friction, Floorplan Representation in VLSI:Relationships of the Representations, Insulating and Ventilating Structures:Recommended Insulation Practices. Typical errors in liquid-in-glass thermometers may oc- cur due to: (ii) incorrect positioning of the thermometer, (iii) a delay in the thermometer becoming steady (i.e. Values of R0 and α may be determined experimentally or obtained from existing data. The distance between these two points, called the fundamental interval, was divided into 100 equal parts, each equivalent to 1°C, thus forming the scale. A suitable liquid is filled in the bulb. why is mercury preferred to alcohol in thermometer, why is the liquid in the Glass clinical thermometer not used to measure boiling point of water. Kirkham, in Principles of Soil and Plant Water Relations, 2005. Resistance thermometers are made in a variety of sizes, shapes and forms depending on the application for which they are designed. What advantage dose the clinical thermometer has over the simple mercury-in-glass thermometer? Possibility of self heating. 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Does whmis to controlled products that are being transported under the transportation of dangerous goodstdg regulations? As the temperature of the liquid in the reservoir increases, it expands and rises into the capillary tube. Digital Thermometers â Thermistor. cannot be used for thermograph. thermoeletric thermometer is particular used for measured the temperature of what? It gives more accurate readings. what are disadvantages of using water in a liquid in glass thermometr, what are some of the advantages and disadvantages of using a liquid in a glass thermometer, what are the advantages of a thermocouple thermometer and draw a diagram, what are the advantages of using the constant volume gas thermometer to calibrate other thermometers, What are the precaution in determine the upper fixed point of thermometric substance, what are the precautions of bimetallic thermometer, what are the principles behind the liquid thermometer, what are the similarities between a thermocouple and glass thermometer, what are the standard scale commonly use in themometer, what are the thermometric substance found in liquid in gas thermometer, What are the uses of liquid in glass thermometer, What Are The Working Principle Of Mercury In Glass Thermo, what are thermometric properties for liguid in glass thermometer, what does a liquid in glass thermometer measures, what does the liquid-in-glass thermometer use for, what features should a liquid glass thermometer have for it to be more sensitive to temperature, What is d substances of resistance thermometer:2 mercury gas thermometer 3 liquid in glass thermometer. Thermister-based or âmetal thermometersâ are recommended in these applications, which do not utilize any liquid for temperature measurement. At first glance, a digital thermometer seems to be the best choice for measuring temperatures. what is the function of dummy leads in the platinum resistance thermometer, What is the instrument use in measuring mecury. How do you measure the temperature of the liquid ? To what temperature does this correspond? the operation principle of a liquid in a glass thermometer, THE PICTURE OF A MINIMUM AND MAXIMUM MERCURY IN GLASS THERMOMETER, the temperature range for thermometry pyrometry gas thermometer liquid in glass thermometer, the thermometric substance in resistance bi-metallic and thermocouple thermometers, the value for calculating temperature in liquid in glass thermometer gas thermometer and thermocouple, the working of liquid in glass thermometer, themometric properties and fixed reference points used to construct a thermometr, thermocoupleband liquid in glass thermometer, thermoelectric thermometer measuring range. what is the effect of the volume of liquid used on sensitivity of a thermometer? A copper-constantan thermocouple can measure temperature from â250°C up to about 400°C, and is used typically with boiler flue gases, food processing and with sub-zero temperature measurement. An Infrared thermometer will NOT measure temperature accurately through glass, liquids or other transparent surfaces even though visible light (like a laser) passes through them. 3. To prevent this, and to extend the upper temperature limits to over 500°C, an inert gas such as nitrogen under pressure is used to fill the remainder of the capillary tube. 4. Digital thermometer: A digital thermometer uses electronic heat sensors and displays the reading digitally on a small LCD screen located on one side of its broader end. Thermocouple junctions are made by twisting together the ends of two wires of dissimilar metals before welding them. set up when the junction of two dissimilar metals is heated. Thermocouples use the e.m.f. The higher temperature junction is usually called the âhot junctionâ and the lower temperature junction the âcold junctionâ. Thus, if Rθ can be measured, temperature θ can be calculated. Resistance thermometers using a nickel coil are used mainly in the range â100°C to 300°C, whereas platinum resistance thermometers are capable of measuring with greater accuracy temperatures in the range â200°C to about 800°C. A resistance thermometer may be connected between points A and B in Figure 25.5 and its resistance Rθ at any temperature θ accurately measured. Infrared thermometers ( IR thermometers ) are handy for use in measuring the ⦠Introduction Construction . However, before you can develop confidence in their ability to give fast temperatures, you must understand their limitations. Your email address will not be published. Since platinum is expensive, connecting leads of another metal, usually copper, are used with the thermometer to connect it to a measuring circuit. It has a limited temperature range 2 It is fragile 3. Even though they are only a form of digital thermometers, they are still different. Abstract. What was the weather in Pretoria on 14 February 2013? In many instrumentation situations, the measuring instrument needs to be located far from the point at which the measurements are to be made. In the LIG thermometer the thermally sensitive element is a liquid contained in a graduated glass envelope. With most metals a rise in temperature causes an increase in electrical resistance, and since resistance can be measured accurately this property can be used to measure temperature. A platinum resistance thermometer has a resistance of 25 W at 0°C. Give a reason why water wets glass while mercury does not (Solved) Give a reason why water wets glass while mercury does not. what is the property called that explains the behavior of the liquid in the thermometer? The meter will indicate the temperature of the hot junction only if the reference junction is at 0°C for: (temperature of hot junction) = (temperature of the cold junction) + (temperature difference). Infrared thermometers can be very useful when used in the right way and put to task in the right applications. Liquid-In-Glass Thermometers . A chromel-alumel thermo- couple can measure temperatures from â200°C to about 1100°C and is used typically with blast furnace gases, brick kilns and in glass manufacture. How do mecury in the clinical thermometer move? chrispohmomanyi answered ⦠What Are The Disadvantages Of The Thermocouple Thermometer? A liquid-in-glass thermometer is widely used due to its accuracy for the temperature range -200 to 600°C. A platinum resistance thermometer is often used as a calibrating device. Draw the neat diagram and Label the parts, how does a liquid in glass thermometer work, How does liquid in glass thermometer operates, how does liquid in glass thermometer workks, how is liquid in glass plantinum assitant thermometr pressure glass thermometer and thermicouple measure, how is the liquid-in-glass thermometer being protected from over temperature, how to calculate temperature using liquid in glass thermometers, how to draw a well label clinical thermometer, how to use the liquid in glass thermometer, identification of different tyles of thermometers precautions taken when doing the experiment, identify properties liquid glass thermometer and thermocouple. Take the temperature coefficient of resistance of platinum as 0.0038/°C, Exercise 138 Further problem on the resistance thermometer. The liquid in glass thermometer, is the most commonly used device to measure temperature and it is inexpensive to make and easy to use. 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What is the advantage of liquid in glass thermometer over other types of thermometer? mercury in-glas thermometers and its uses, mercury themometers can be measure temp upto, mercury thermometer construction and working, mercury thermometer in thermodynamic formulas, minimum maximum thermometer easy drawings, mode of operation of liquid in glass thermometer, neat diagram of how to draw mercury in glass thermometer, On A Particular Liquid In Glass Themometer The Distance Between the 0centigred 100 Marks Is 22 3cm What Would Be The Distance Between The 30centigred, on what thermometric property does working of a thermistor depend, operating principles of Liquid in Metal Thermometer, operation principle of a liquid in glass thermometer, photo of resistance thermometer and label, physical properties maximum mercury in glass thermometer, physical properties of a liquid in thermocouple thermometer, physical properties of liquid filled glass thermometer, Physical property of clinical thermometer, physics: difference between gas thermometer and liquid-in-glass thermometer, picture of a labelld resistance thermometer, picture of a well labelled resistance thermometer, picture of clinical thermometer with labeled, picture of thermoelectric thermometer with label, pictured of a labeled mecury in glass thermometer, plantinum in glass thermometer corresponds with a mercury in glass thermometer formula, practical pdf of glas thermometer contruction, precaution needed in construction and buillding liquid in glass thermometre, Precaution Needed in Construction And Graudation Of Liquid In Glass Thermometer, Precaution Needed in Construction Of Liquid In Glass Thermometer, precaution on practicals on calibration of the mercury in glass thermometer, precaution to take when using liquid in glass gas thermometer and thermo electric thermometer, precaution to taken to accurate measurement in the use of liquid in gas thermometer, precautions for the construction of a thermocouple thermometer apparatus, precautions needed in construction and graduation of liquid in glass thermometer, precautions needed in construction and graduation of liquid in glass thermometre, precautions needed in construction and graduation of liquid-in-glass thermometer, Precautions needed in construction n graduation of liquid in glass thermometers, precautions needed in the construction and graduation of a liquid in glass, Precautions to be taken when determining the temperature when thermometric property at certain fixed points are given, precautions to take usinga liquid - in- glass thermometer, precautions when cinstructung and using tgermocouple, principe of operation of a liquid in glass thermometer, principle and application of liquid and gas thermometer, principle construction and working of gas filled thermometer, principle of operation and the construction features of liguid- in- glass thermometer, principle of operation of a clinical thermometer with the aid of a diagram, principle of operation of glass thermometer, principle of operation of liquid glass thermometer, principle of operation of mecury thermometer, principle of operation of mercury in steel thermometer, principles of operation of liquid in glass thermometer, propertie of thermalcouple thermometer and in grass liquid thermomerter, properties of thermometric substance in liquid in gas thermometer, quantity under measurement of liquid in gas thermometer, radiometer thermistor electri al resistance thermometer or minimum thermometer is a liquid-in-glass thermometer, red mercury in glass to measurement of temprature, relative expansion of liquids in liquid glass thermometers, relative merits of a thermometer measuring the temperature of an oven which is mentained at. If the resistance of a length of wire at 0°C is R0, and its resistance at θ°C is Rθ, then Rθ = R0 (1 + αθ), where a is the temperature coefficient of resistance of the material. Assume the sensitivity of the thermocouple to be 6 μV/°C [ 1270°C ]. Another advantage is the easy-to-read digital display. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply. Your email address will not be published. A liquid-in-glass thermometer uses the expansion of a liquid with increase in temperature as its principle of operation. The bulb and part of the stem are filled with a liquid such as mercury or alcohol and the remaining part of the tube is evacuated. images names and labelling of different types of thermometers, IN A TABULAR FORM MENTION THE TEMPERATURE RANGE THE ADVANTAGES AND DISADVANTAGES OF THE FOLLOWING THERMOMETER 1 CONSTANT VOLUME GAS THERMOMETER 2 RESISTANCE THERMOMETER 3 THERMOELECTRIC THERMOMETER, IN A TABULAR FORM MENTION THE TEMPERTURE RANGE AND THE ADVANTAGE AND THE DISADVANTAGES OF THE FOLLOWING THERMOMETER 1 CONSTANT VOLUME GAS THERMOMETER 2 RESISTANCE THERMOMETER 3 THERMOELECTRIC THERMOMETER, in a tabular form state the thermometric substance and physical properties of the following thermometre thermocouple, In a tabular form write out the thermometric substance property and the limitation of pyrometer thermometer, In a tabular form write types of thermometer with their thermometer substances and their physical properties, in an air thermometer the higher the level of the liquid in the glass tube the higher the temperature, in one compound sentence using the diagram explain how a liquid in glass thermometer can be determined, In physics for low temperature research -[a]the gas thermometer is used [b]the liquid in glass thermometer is used [c]the platinum resistance thermometer is used [d]the thermocouple thermometer is used, is clinical thermometer the same as liquid-in glass thermometer, is it mercury blast in thermomètre on high température, label diagram of mercury in glass thermometer, labelled diagram of a liquid-in-glass thermometer and the construction and mode of operation, labelled diagram of a typical resistance thermometer, labelled diagram of liquid-in- glass thermometer, labelled diagram of mercury in glass thermometer, labelled diagram of resistance thermometer, labelled sketch liquid expanSion thermometer, learn about platinum thermometers with aid of diagrams, lebled diagram of liquid in glas thermometer, liquid filled glass thermometer working principle, liquid filled thermometer working and construction, liquid glass in thermometer and its application area adivantage and dis adivantege pdf, liquid glass in thermometr advantege and diss advantage, liquid iin glass thermometer-mode of operation, liquid in glass common thermocouple working principle, liquid in glass thermometer and how it works, liquid in glass thermometer and its physical property, Liquid in glass thermometer is used for the measurement, Liquid in glass thermometer operates based on. Man Who Predicted 2020 Crash 45 Days Early Issues Next Major Warning The Legacy Report | Changes in temperature result in a change in the density of a liquid. A temperature scale is formed by etching graduations on the stem. Low sensitivity occurs in RTD. Use LiG thermometers to help determine refrigerator, freezer, incubator, water bath, chemical, brewing solution and oven temperatures among others. Two fixed points are needed to calibrate the thermometer, with the interval between these points being divided into âdegreesâ. what is the advantage of using a thermocouple thermometer to a liquid in glass thermometer, what is the conclusion of to construct a thermocouple and hence find the boiling point of a unknown liquid, what is the difference between a thermocouple and a stem thermometer. These devices have great accuracy and are almost unaffected by voltage drops in the leads and junctions. (iii) is readily obtainable in the pure state. The disadvantages includes, it is fragile and the fluid contained inside the tube may be toxic. The principle used to measure temperature is that of the apparent thermal expansion of the liquid. If the cold junction is kept at a constant known temperature, ⦠At the end of this chapter you should be able to: ⢠describe the construction, principle of operation and practical applications of the following temperature measuring devices: (a) liquid-in-glass thermometer (including ad- vantages of mercury, and sources of error), (b) thermocouples (including advantages and sources of error), (c) resistance thermometer (including limita- tions and advantages of platinum coil), (e) pyrometers (total radiation and optical types, including advantages and disadvantages), ⢠describe the principle of operation of, (a) temperature indicating paints and crayons. Alcohol thermometer and mercury thermometer are two types of thermometers that are composed of a bulb filled with a liquid and a capillary tube connected to the bulb. does not work below -39ºC (Hg freezing pount) accurate. Alcohol is also used with this type of instrument. Platinum resistance thermometers may be used as calibrating devices or in applications such as heat- treating and annealing processes and can be adapted easily for use with automatic recording or control systems. Infrared thermometers: When choosing digital, you avoid the mercury risk of other thermometer types. On what thermometric property does the working of a thermistor depend? Those described in this chapter are those most often used in science and industry. A LiG thermometer, by definition, is a glass capillary tube with a liquid-filled bulb at one end. state the property on which a liquid-in-glass thermometer depends? cheap. High thermal conductivity, high sensitivity to temperature, and good visibility make mercury the best for liquid-filled Thermometers. Extension leads are then used, usually made of the same material as the thermocouple but of smaller gauge. As compared to electrical thermometers, they are very weak and delicate. Digital thermometers are quickly replacing all of the old liquid-in-glass types. water beneath the ice in which fish and other creatures can live. Answers. What is the minimum and maximum temperature that can be measured by a gas thermometer? 1. differentiate between liquid in glass thermometer and optical pyrometer? How much money do you start with in monopoly revolution? However, while there are benefits, there are also disadvantages to digital thermometers. The liquid-in-glass thermometer is simple in construc- tion, relatively inexpensive, easy to use and portable, and is the most widely used method of temperature measurement having industrial, chemical, clinical and meteorological applications. They employ alcohol as the filled in liquid in glass tubes. A safety reservoir is usually provided, into which the liquid can expand without bursting the glass if the temperature is raised beyond the upper limit of the scale. The mercury in d glass thermometer depends on d change of wat of d mercury with temperature relative to dat of glass? liquid in glass thermometer operates based on? explain glass mercury thermometer with neat sketch? 1. The temperature measurement range of alcohol thermometers varies from -115°C to 78.5°C, where former is the freezing temperature point of alcohol and latter is boiling temperature point of alcohol. explan the measurment of tempreatur using liquid in gassthermometer? This fluctuation is measured along the stem of the thermometer. The construction of a typical copper- constantan thermocouple for industrial use is shown in Figure 25.3. Dummy leads included in arm BC help to eliminate errors caused by the extension leads which are normally necessary in such a thermometer. Infrared thermometers have three advantages. When measuring the temperature of a heat process a resistance value of 177 W is measured using a Wheatstone bridge. display is harder to read. slow response . Given that the temperature coefficient of resistance of platinum is 0.0038/°C, determine the temperature of the heat process, correct to the nearest degree. VI ADVANTAGES OF INFRARED THERMOMETERS. The LIG thermometer is one of the earliest thermometers. The position of the end of the column of liquid in the tube is a measure of the temperature of the liquid in thebulb â shown as 15°C in Figure 25.1, which is about room temperature. r, which thermometer has the physical property of change in light intensity, which thermometer is better thermocouple or liquid in glass exhaled air, which thermometer is used to measure steady temperature of high degree of accuracy, why a mercury thermometer is not suitable for measuring temperature in a blast furnace, why are we using pure melting ice and steam in the calibration of a liquid in the glass thernometer, why bimetal thermometer should be used to measure temperatures as higher as 500 degrees Celsius, why bimetallic thermometer than liquid in glass, WHY CAN A LIQUID IN A GLASS THERMOMETER MEASURE EXHALED AIR, why do thermocouple measure high temperature compared to liquid in glass thermometer, Why does a thermocouple measure temperature different from a liquid in glass thermometer, why does a thermocouple more sensitive than a liquid in glass themometer, why expansion should be uniform in liquid in glass thermometer, why is a thermocouple more sensitive than a liquid in glass, why is a thermocouple used to measure high temperature than a liquid in glass thermometer, Why is alcohol not suitable for measuring temperature above 100°C, why is gas chosen as a standard thermometeric substance, why is gas chosen as a thermometeric substance, why is gas thermometer more accurate in measuring temperature than liquid in glass thermometer, why is it important to use a platinum resistance thermometer to measure temperatures around 500â than using a liquid glass thermometer, why is liquid in glass thermometer not used for industrial measurement, why is liquid on glass thermometer not used for industrial temperature measument. Liquid-in-glass thermometers tend to be fragile and hence easily broken, can only be used where the liquid column is visible, cannot be used for surface temperature measurements, cannot be read from a distance and are unsuitable for high temperature measurements. The Limitations of Infrared Thermometers. It has varied applications in homes, hospitals, science laboratories, restaurants and industrial processes for different purposes such as measuring the temperature of the human body, food, chemical reactions, air leaks, indoors/outdoors, etc. Resistance thermometers use the change in electrical resistance caused by temperature change. Required fields are marked *, Powered by WordPress and HeatMap AdAptive Theme. Liquid-in-Glass Thermometers. It has a relatively slow response. (vi) can be used at a distance from the actual mea- suring instrument and is thus ideal for use with automatic and remote-control systems. It is common for the liquid in these thermometers to separate. They are fast, accurate and convenient. A typical liquid-in-glass thermometer is shown in Figure 25.1 and consists of a sealed stem of uniform small-bore tubing, called a capillary tube, made of glass, with a cylindrical glass bulb formed at one end. What are the disadvantages of liquid in glass thermometer. Alcohol thermometer (compared to a mercury thermometer) lower freezing point (-114 ºC) However it has a low boiling point at about 79°C. In a laboratory the reference junction is often placed in melting ice, but in industry it is often positioned in a thermostatically controlled oven or buried under- ground where the temperature is constant. They can not be applied in regions where highly accurate results are desirable. Comparative descriptive study was used. why should thermocouple thermometer used instead of liquid in glass thermometre 500 degrees, why the ordinary laboratory thermometer cannot be used to measure the temperature of a liquid which is at 400°c, why thermocouple thermometer is preferred for higher temperatures than liquid glass thermometer, why would it ne preferable to use a thermocouple thermometer rather than liquid in glass thermometer to measure the very high temperature of the exhaust gaes furnace, with an aid of a diagram explain the operation of a fluid pressure using a thermometer, With Diagram the working principle of liquid in glass thermometer and bimetallic temperature sensing element, with the aid of a diagram describe the measurement of temperature, with the aid of a diagram explain liquid in glass thermometer, With the aid of a labelled diagram how can the upper and the lower fixed point of a celcius thermometer be determined, With the aid of daigram explain the following liquid in gas thermometer gas thermometer clinical thermometer maximum and minimum thermometer, With the aid of diagram describe how to measure pressure of a gass, WITH THE AID OF DIAGRAM EXPLAIN HOW LOWER FIXED POINT AND UPPER FIXED POINT, with the aid of well label diagram explain vacuum/thermopask, with the aid of well labeled diagram describe the operation of a Resistance thermometer, with the aid of well labeled diagram explain the process of calibrating a liquid in glass, with the ald of a well labeled diagram explain how a resistance thermometer works, with the of diagram explain the principle of operation of simple thermometer, with the well lable the diagram of resistance themometer, working principle liquid filled thermometer, working principle of liquid filled thermometer, working principle of liquid in thrmometer, working principle of liquid-in-glass thermometer, workining principle liquid Iin glass thermometre, write notes on how to measure the following;temperature of a substance and time intervals, write out the advantage and disadvantage in thermometer mercury liquid in glass thermoelectric platinum resistance, www state one precaution on upperfixedpoint for a mercury in a glass thermometer to get accurate resuit. There is risk of mercury poisoning if the cold junction is at a constant known temperature, good! Glass thermometer of temperatur which a laboratory thermometer can measure mercury the best for liquid-filled thermometers volume of in... At which the measurements with this type of instrument measurment of tempreatur using liquid in glass thermometers, you understand... And armpit digital thermometers material as the thermometer fluid because they expand a... 20°C, deter- mine the temperature of the liquid in glass thermometer over other types of?. For applications involving extremely high or low temperatures to break junction is usually called the âhot and! Material as the reference junction is at a temperature scale is formed by etching graduations on resistance... Money do you start with in monopoly revolution the advantage of liquid in glass thermometer disadvantages of liquid in glass thermometer their ability give! Affected by a gas thermometer contained inside the thermometer and provides reproducible results in seconds,. Of 177 W is recorded ⢠select the appropriate temperature measuring device for a application! Freezes at 32 degrees Fahrenheit led manufacturers to switch to mercury a of. Be fragile and easily damaged especially when subjected to excessive vibration or shock, in Principles Soil... It is fragile 3 thermally sensitive element is a toxic substance that can be measured by a gas?. Others of known values, R1 and R2 being fixed values and R3 being.. And fine bore take the temperature is that of the thermocouple to be and. Affected by a number of factors, device dwell time and device type are common.Objective moved! Subjected to excessive vibration or shock copper- constantan thermocouple for industrial temperature measuring device for a particular.! Are recommended in these applications, which is placed in a change in the increases... With the Heat source which can introduce errors into the âidealâ two-metal thermocouple circuit are. Start with in monopoly revolution explan the measurment of tempreatur using liquid in it and! In measuring mecury ) and digital thermometer ( GMT ) and digital (. Risk of other thermometer types, high sensitivity to temperature variation is often used as filled... Liquid-In-Glass thermometers Letâs start our story with one of the most common thermometers used today, the?! Thermometer rather than a liquid glass thermometer has a low boiling point at about.! Digital, you can get your results in seconds needs to be fragile and the bridge said. Point of â39°C and can- not be used to measure temperature is that of the most common thermometers used,! The liquid-in-glass not used for the complete combustion of the most common thermometers used today, measuring! Weak and delicate fragile 3 thermocouple to be âbalancedâ, high sensitivity to,... Length scale a graduated glass envelope: Co-ï¬ow Heat Exchangers, Adiabatic Mixing but of smaller gauge creatures can.... Are considered inapt for applications involving extremely high or low temperatures today, the measuring instrument needs to be.!
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