The correct option is B Thermometer
Degree
of the heat of our body is known as temperature. The instrument which is used to
measure the temperature is known as a thermometer. Thermometers are of two types:
- Clinical thermometer and Laboratory thermometer. They have different
markings, but they work in the same way. In
the thermometer, a glass tube is filled with mercury. Mercury is used to measure temperature because it changes from a solid to liquid very easily.