Solution 2. Use Boyle's law in the form PV= PV, where conditions (1) are at sea level and (2) are at the higher altitude:

(1atm) (7600 liters) = (0.70 atm) V




A drop in pressure to 0.70 atm has permitted the gas in the balloon to expand.







Right: Sir Robert Boyle (1627 - 1691)