Problem

A balloon partially filled with helium has a volume of

30 \text{ m}^3

, at the earth's surface, where pressure is

76 \text{ cm of Hg}

and temperature is

27^\circ \text{C}

. What will be the increase in volume of gas if balloon rises to a height, where pressure is

7.6 \text{ cm of Hg}

and temperature is

-54^\circ \text{C}