Boyle's Law Calculator

Boyle's Law applies to ideal gases at constant temperature (isothermal process). Real gases deviate slightly at very high pressures or low temperatures. For most practical purposes at normal conditions, Boyle's Law gives accurate results.

A syringe demonstrates Boyle's Law: pulling the plunger increases volume and decreases pressure below atmospheric, drawing fluid in. Pushing the plunger decreases volume, increases pressure, and forces fluid out.

When you inhale, the diaphragm contracts and chest volume expands. By Boyle's Law, pressure inside drops below atmospheric, drawing air in. When you exhale, the chest contracts, volume decreases, pressure rises, and air is expelled.