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On the contrary the saturated volume is the volume a gas mixture would have if humidity was added to it until saturation (or 100% relative humidity).

Humid air is less dense than dry air because a molecule of water [[Molecular mass}} is less massive than either a molecule of nitrogen ''m'' ? 28 or a molecule of oxygen ''m'' ? 32. About 78% of the molecules in dry air are nitrogen (N₂). Another 21% of the molecules in dry air are oxygen (O₂). The final 1% of dry air is a mixture of other gases.

For any gas,

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