The volume of a hot-air balloon is 600 m3
and the surrounding air is 1.25 kg/m3
. The balloon
just hovers clear of the ground when the burner has heated the air inside to a temperature at
which its density is 0.8 kg m-3
.
(a) What is the total mass of the balloon, including the hot air inside it?
(b) What is the total mass of the balloon envelope and its load
