Gas does not evaporate. To evaporate means to “become a vapor”, and gas already IS a vapor. That said, the phenomenon you are likely observing is caused because gas does not have a fixed volume. Gas molecules spread out from each other to fill whatever container they’re in, unlike liquids which change shape but stay the same “size” unless more liquid is added.
If you’re asking about gasoline, it’s because the gasoline molecules are nonpolar and larger, so they have less attraction to each other. This makes their boiling point lower than water’s so they evaporate with less energy applied than water.
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