There are two balloons, both the same size and temperature. One balloon contains hydrogen and the other balloon contains carbon dioxide. The hydrogen balloon floats, and the carbon dioxide balloon sinks in the air. How do the pressures inside of the two balloons compare?
A) The carbon dioxide balloon has a greater pressure than the hydrogen balloon.
B) The hydrogen balloon has a greater pressure than the carbon dioxide balloon.
C) The pressures in both balloons are essentially the same.
D) This problem cannot be solved without more information given.

Question

Quizplus · Accepted Answer

The pressures inside both balloons are essentially the same if they are at the same temperature and volume, according to the ideal gas law (PV=nRT). The difference in buoyancy is due to the difference in the molecular weights of the gases, not the difference in pressure.

There Are Two Balloons, Both the Same Size and Temperature