1. The problem statement, all variables and given/known data "It's possible to use the ideal gas law to show that the density of the Earth's atmosphere decreases exponentially with height, that is ρ=ρ0exp(-z/z0) where z is the height above sea level, ρ0 is the density at sea level and z0 is called the "scale height" of the atmosphere. a.) Determine value of z0: b.) What is the density of the air in Denver, at an elevation 1600 m? What percent of sea-level density is this? 2. Relevant equations Ideal gas law: Pv=nRT possibly P=P0 + ρgh ? Seems unlikely as ρ varies? 3. The attempt at a solution Not quite sure how to go about this one. Started with ideal gas law Pv=nRT assumed we'd be comparing two volumes of gas (at height z0 and z) with equal number of molecules, at equal temperature, thus P1v1=P2v2 Then substituted v=ρ(mass) Again assuming equal mass would imply P1ρ1=P2ρ2 Not really sure how to proceed to involve height instead of pressure or even if on right track... Somehow the latter seems more likely. Help would be appreciated!