1. The problem statement, all variables and given/known data above each square inch of earth's surface is 14.7 lbs of air. the density of air at sea level is about 1.27g/L. the earth is 7930 miles in diameter and has a mass of 5.98 x 10^24kg. a.) use the data above to determine the mass in kg of the earth's atmosphere. b.) determine the average density of earth in grams per milliliter. 2. Relevant equations i think the only relevant equation is d=m/v. everything else seems to be unit conversions. this problem really isnt about the atmosphere, but rather how well i can convert units, and apparently not well. 3. The attempt at a solution im looking for the mass of the atmosphere, so i use m = dv d is 1.27g/mL i derive v from 4/3pir^3 but i have the radius in miles. does this matter? i would get (1.27g/mL)(2.55x10^11) since i need it in kg (1.27 x 10^-3kg)(2.55x10^11) = 3.24 x 10^8 kg/mL? im sure im hopelessly wrong. i dont really want to do part b until i get part a.