The internal energy of a monatomic ideal gas molecule is


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The internal energy of a monatomic ideal gas molecule is

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The internal energy of an ideal gas. The result above says that the average translational kinetic energy of a molecule in an ideal gas is 3/2 kT. For a gas made up of single atoms (the gas is monatomic, in other words), the translational kinetic energy is also the total internal energy.

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