81.
When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

82.
All perfect gases change in volume by $${\frac{1}{{273}}^{{\text{th}}}}$$ of its original volume at 0°C for every 1°C change in temperature, when the pressure remains constant. This statement is called

83.
Which of the following statement is wrong?

84.
A process of heating crude oil to a high temperature under a very high pressure to increase the yield of lighter distillates, is known as

89.
The basis for measuring thermodynamic property of temperature is given by

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