Physics
Which of the following represents a relation for ''heat lost = heat gained'?

Principle of vaporization
Principle of thermal equilibrium
Principle of calorimetry
Principle of colors

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Physics
For an ideal gas, which one of the following statements does not hold true?

The kinetic energies of all gas molecules are not same
There is no interactive force between the molecules.
The potential energy of the gas molecules is zero
The speed of all gas molecules is same

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