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Thread: Does water vapor equal the same mass of rain?

  1. #1 Does water vapor equal the same mass of rain? 
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    Consider this example.
    A parcel of air one cubic meter at temperature 18.5 C.
    The saturated vapor density is 16 g/m^3. (see Relative Humidity)

    If the temperature cools so the vapor condenses to liquid, will there be 16 g of rain?

    Perhaps the answer (yes) is obvious; but I haven't seen it stated.
    What factors could make the rain greater than the vapor?


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  3. #2  
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    The answer is that there can be no more than 16 grams of rain, which is obvious based on conservation of mass. There will actually be less because some moisture will remain in the air. There are no factors that could make the rain greater than the vapor; however through the course of a rainstorm, a particular area of land could receive more rain than the amount contained in the air above it at a particular instant of time.


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  4. #3  
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    A belated thanks for your very helpful reply!
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