The amount of water vapor per cubic meter in the atmosphere as
sea level is 30g/m3.
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Which planet?
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Atmosphere is a measure of pressure, not of length like the
meter.
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The average solar radiation hitting the planet is considered to
be about 352 watts/meter squared. Total radiation hitting our
atmosphere is about 1366 watts/meter squared.
The rest of this energy is absorbed or reflected by the
atmosphere.
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Mercury does not have what we would call an atmosphere. It is
very, very thin , a collection of a few atoms per cubic meter, some
being ionized from the surface. It is less than a trillionth of
Earth's.