at 30 km above the earths surface (roughly in the middle of the statosphere) the pressure is roughly 0.013 atm and the gas density is 3.

at 30 km above the earths surface (roughly in the middle of the statosphere) the pressure is roughly 0.013 atm and the gas density is 3.74 x 10^23 molecules/m^3 assuming N2 is represetative of the stratosphere using the collisional diameter information in 16.1 determine a) the number of collisions a single gas particle undergoes in the region of the statosphere in 1 sb)the total number of particle collisions that occur in 1 s