1. Education
You can opt-out at any time. Please refer to our privacy policy for contact information.

Discuss in my forum

Boyle's Law Example Problem

Gas Law Example Problem


Boyle's Law is one of the gas laws.

Boyle's Law is one of the gas laws.

Paul Taylor, Getty Images
Boyle's gas law states the volume of a gas is inversely proportional to the pressure of the gas when temperature is held constant. This example problem uses Boyle's law to find the volume of a gas when pressure changes.


A balloon with a volume of 2.0 L is filled with a gas at 3 atmospheres. If the pressure is reduced to 0.5 atmospheres without a change in temperature, what would be the volume of the balloon?


Since the temperature does not change, Boyle's law can be used. Boyle's gas law can be expressed as:

PiVi = PfVf

Pi = initial pressure
Vi = initial volume
Pf = final pressure
Vf = final volume

To find the final volume, solve the equation for Vf:

Vf = PiVi/Pf

Vi = 2.0 L
Pi = 3 atm
Pf = 0.5 atm

Vf = (2.0 L)(3 atm)/(0.5 atm)
Vf = 6 L/0.5
Vf = 12 L


The volume of the balloon will expand to 12 L.

©2014 About.com. All rights reserved.