1. The problem statement, all variables and given/known data given: atmospheric pressure near the earth's surfact=100kPa density of the air near the earth's surfact=1.3kg/m-3 radius of the earth=6400km the best estimate for the total mass of the earth's atmosphere: 5x1018 kg. how to work out this value?? 2. Relevant equations I don't know.. 3. The attempt at a solution I don't know..