Definition of Temperature

Temperature is a measure of the degree of hotness or coldness of a body.  It is measured by means of a thermometer.  The S. I. Unit of temperature is the Kelvin.  However, it is also measured in degree Celsius.

The Thermometer

The thermometer is the instrument used for measuring temperature.  There are various types of thermometer, e.g. liquid-in-glass thermometer and the thermocouple.  Each one makes use of the change in the physical properties of materials they are made of, to indicate temperature change.