Thermometric Properties
There are many physical quantities that change with the change of temperature. The change of a physical quantity with the change of temperature can be used to measure temperature. For this purpose the thermometer is accordingly calibrated. This property of a physical quantity is called thermometric property.
It is an experimental fact that liquid expand on increasing their temperature and contract on decreasing the temperature. Thus the change of volume of a liquid with temperature can be used to measure temperature. Gases expand on increasing their temperatures and contract on decreasing the temperature. Hence the change in volume of a given amount of a gas at a constant pressure can be used to measure temperature. Similarly the pressure of a gas changes with change of temperature. Hence the change of pressure of a given mass of a gas at constant volume can be used to measure temperature. Electrical resistances of metals change with temperature. Hence a change of resistance with temperature can be used to measure temperature.
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