1. The problem statement, all variables and given/known data A recreational (open) hot air balloon (i.e., Pinside is approximately Poutside) has a volume of 2107 m3 when fully inflated. The total weight of the balloon, basket, ballast and pilot is 1832.6 N (412 lbs). By how much must the density of the air in the balloon be smaller than that of the surrounding atmosphere in order to keep the balloon floating level near the ground? 2. Relevant equations Buoyant force= volume x g x rho 3. The attempt at a solution I got the right solution, but it was explained much differently in class (much more complicated), and I didn't even use all the values given in the problem. I'm not sure if my logic is correct. I figured that the buoyant force must be equal to gravity because the balloon is not accelerating. v x rho x g = m x g 2107 m^3 x rho x g= 1832.6 N 2107 m^3 x rho = 187 kg difference in rho= 0.0888 kg/m^3 Does what I did make any sense at all? Thanks in advance!