An ideal gas is filled in a vessel,then

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(C) The temperature of an ideal gas is related to the average kinetic energy of its molecules due to their random thermal motion. When a vessel contai

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Its temperature remains constant in a moving car

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(C) The temperature of an ideal gas is related to the average kinetic energy of its molecules due to their random thermal motion. When a vessel containing an ideal gas is placed in a moving train or car,the entire vessel (and the gas inside it) moves with a uniform velocity $v$ relative to the ground. This bulk motion of the gas does not affect the random thermal motion of the gas molecules relative to the centre of mass of the gas. Since temperature depends only on the random kinetic energy of the molecules,the temperature of the gas remains constant regardless of the uniform motion of the vessel. Therefore,the temperature does not increase,and the centre of mass moves with the velocity of the train,not randomly.

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