A ballon contains 30.0L of helium gas at 103 KPa. What is the volume of the helium when the balloon rises to an altitude where the pressure is only 25.0 KPa?
volume is inversely proportional to pressure
v = 30.0 L * (103 kPa / 25.0 kPa)
v = 30.0 L * (103 kPa / 25.0 kPa)