Question

the volume of a gas is not
effected


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Answer 1

Why is the volume of a gas not affected by the size of its atoms?

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Technically, it is. The ideal gas law assumes that the atoms have no volume and don't directly interact. Under typical circumstances (such as room temperature and moderate pressures), these are a good, simplifying assumptions. The reason they're effective is because the space between the molecules in a gas is vastly bigger than the volume of the molecules themselves, and most of the molecules are so far apart that their interactions don't have much of an effect.