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mass = density * volume.

Air density is p/RT, where R is the gas constant for air (287 J/kg-K), T is the absolute temperature and p is the pressure, equal to 101325 Pa at sea level.

At sea level and room temperature, the density of air is

rho 101325 N/m2/(287 N-m/(kg-K)*293 K

or about 1.2 kg/m3.

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