Podcast
Questions and Answers
What is one advantage of bimetal thermometers?
Bimetal thermometers can be used for remote temperature readings.
False
What is the principle behind liquid expansion thermometers?
All liquids expand as temperature rises.
Mercury-in-glass thermometers typically have a temperature range limited by its freezing point of _____ °C and boiling point of _____ °C.
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What does the equation $V_1 = V_0(1 + eta T^2 + ext{others})$ represent?
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Match the following components of a mercury-in-glass thermometer:
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Study Notes
Bimetal Thermometers
- These thermometers are inexpensive, rugged, and easy to use.
- They have a wide temperature range and a nearly linear response.
- They can be equipped with a recorder for continuous monitoring.
- They are limited in accuracy, must be installed locally, and cannot measure remote temperatures.
- Calibration can shift if the thermometer experiences rough handling.
- They are suitable for measurements where local temperature readings are needed and the measurement points are accessible.
Liquid Expansion Thermometers
- Liquids expand proportionally to temperature increases.
- This expansion can be used to measure temperature.
- The relationship between volume and temperature is described by an equation with coefficients of volumetric expansion.
Mercury-in-Glass Thermometers
- They consist of a glass stem with a bulb and a capillary tube.
- The bulb has a larger volume than the capillary.
- The capillary is often made of a different glass than the bulb for better workability.
- The stem has a lens-shaped front for magnification and a white-enameled back for contrast.
- A restriction in the capillary prevents mercury from flowing back into the bulb.
- The open end of the capillary is sealed under vacuum and sometimes contains an inert gas to increase the usable temperature range.
- Industrial thermometers often have a metal case to protect the bulb and are placed in a thermal well to minimize breakage.
- Mercury is commonly used as the liquid, but its temperature range is limited by its freezing and boiling points.
- By pressurizing the thermometer with a gas like nitrogen, the upper temperature limit can be extended to about 538 °C.
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Description
This quiz explores the different types of thermometers, including bimetal, liquid expansion, and mercury-in-glass varieties. Learn about their construction, usage, and limitations, as well as the principles behind their operation. Test your knowledge on how these thermometers measure temperature and their applicable scenarios.
