# A helium-filled balloon escapes a child's hand at sea level and 23.0 C. When it reaches an altitude of 3000 m, where the temperature is 4.4 C and the pressure is only 0.71 atm, how will its volume compare to that at sea level?

##### 1 Answer

Sep 17, 2016

#### Answer:

It will be 1.5 times larger.

#### Explanation:

The altitude itself is irrelevant. The ideal gas law states

Therefore, the volume at 3000m is 1/0.665 = 1.5 times larger than at sea level.