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Air weighs 1.2g per cubic metre at 20deg Celsius and at sea level.

With different temperature or pressure, the density of air is:

d = p / (R x T)

d is the calculated density of air

p is the pressure

R is the specific gas constant (287.05)

T is the temperature.

With differing altitudes and any water vapour (humidity), the weight of air varies in a much more complex fashion.

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