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Thermal Equilibrium

When a gas is...

Question

When a gas is in thermal equilibrium, its molecules

A

have the same average kinetic energy.

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B

have different energies which remains constant.

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C

have a certain constant energy.

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D

do not collide with one another.

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Solution

The correct option is A have the same average kinetic energy.
When a gas is in thermal equilibrium, the temperature throughout the gas is the same. (Zeroth law of thermodynamics)
The average kinetic energy of the gas molecules is directly proportional to the absolute temperature of the gas. I.e. different sections of the gas will all have the same average kinetic energy.

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