Zeroth law of thermodynamics is that , when a body "A" is in thermal equilibrium with body "B" and the body "B" is in thermal equilibrium with body "C" , then automatically body "A" will be in thermal equilibrium with body " C".
The concept of the thermometer is based on the " zeroth law of thermodynamics "
Thermometer -: Thermometer is a device or a measuring instrument which is used to measure temperature ( how hot or cold some- thing is ).
Types of thermometer--
1. Resistance thermometer
2. Thermo couple -: It is based on the see - back effect .
3. Constant volume gas thermometer-:
It is works on the pressure change .
4. Constant pressure gas thermometer-:
It is works on the change in volume.
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