Thermometers: Bimetal, Liquid Expansion, Mercury Types
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Questions and Answers

What is one advantage of bimetal thermometers?

  • Cannot be damaged easily (correct)
  • Low cost (correct)
  • High accuracy
  • Remote temperature readings
  • 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.

    <p>-39, 357</p> Signup and view all the answers

    What does the equation $V_1 = V_0(1 + eta T^2 + ext{others})$ represent?

    <p>Volume of a liquid</p> Signup and view all the answers

    Match the following components of a mercury-in-glass thermometer:

    <p>Capillary = Uniform bore for measurement Bulb = Large volume compared to capillary Open end of capillary = Sealed under vacuum Lens-shaped end = Magnifies the mercury column</p> Signup and view all the answers

    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.

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