- What happens to the pressure of a sample of helium gas if the
volume is reduced from 6 liters to 3 liters, with no change in
temperature?
Here’s How to Crack It
The ideal gas law, PV = nRT, tell us that if T remains constant, then P is inversely
proportional to V. So, if V decreases by a factor of 2, then P will increase by a
factor of 2.