A balloon has volume 1000 m^3. It is filled with hydrogen (rho = 0.09 g/l). If the density of air is 1.29 g/l, it can lift a total weight of A balloon has volume 1000 m^3. It is filled with hydrogen (rho = 0.09 g/l). If the density of air is 1.29 g/l it can [...]