Multiple choice

Which thermometer is based on the thermal expansion of liquids?

  1. Gas thermometer

  2. Thermoelectric thermometer

  3. Radiation thermometer

  4. Liquid thermometer

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Liquid thermometers depend on the thermal expansion of liquids such as mercury, alcohol etc. The commonly used liquid thermometer is mercury thermometer which uses mercury as the thermometric liquid. The thermometer consists of a cylindrical glass bulb containing mercury to which a graduated capillary tube of uniform bore is attached. The change in temperature is shown by the apparent expansion of mercury in glass and the resulting movement of the mercury meniscus in the system of the thermometer.As mercury freezes at -38.8 0C and boils at 3560 C, the mercury thermometer can not be used for very low or very high temperature measurements. A mercury thermometer can be used to measure temperatures up to 3000C