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The amount of water vapor in the air varies depending on weather conditions. In extremely dry conditions there can be almost no water vapor, while in tropical areas water vapor can comprise more than 4% of the air by volume.

Saturated air at 30° C (82°F) can hold about 30 grams (1 ounce avoirdupois) of water per cubic meter of air. At 42° (108°F), the saturation point is about 55 grams, or nearly twice as much.

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