Boyle's Law
An ideal gas law stating that pressure is inversely proportional to volume at constant temperature.
Governing formula
P1 V1 = P2 V2 (at constant T)
SI unit
Pa·m³
In depth
Decreasing container volume forces gas molecules into a smaller space, increasing wall collision frequency per unit area and doubling pressure when volume is halved.
Examples in the real world
Squeezing a party balloon reducing its volume while dramatically increasing internal air pressure.