In a mercury thermometer, a glass tube is filled with mercury and a standard temperature scale is marked on the tube. With changes in temperature, the mercury expands and contracts, and the temperature can be read from the scale. Mercury thermometers can be used to determine body, liquid, and vapor temperature.
Also question is, what are liquid in glass thermometers?
In the past, that liquid was usually mercury. However, many glass thermometers today contain a red liquid called spirit instead of mercury. If the liquid in your glass thermometer is silver-colored, it contains mercury.
Considering this, what is called thermocouple? thermocouple, also called thermal junction, thermoelectric thermometer, or thermel, a temperature-measuring device consisting of two wires of different metals joined at each end. One junction is placed where the temperature is to be measured, and the other is kept at a constant lower temperature.
In this regard, which is commonly used in liquid expansion thermometer?
mercury