Portrait of Robert Boyle

Source: SS-buckland, User, Wikimedia Commons

Boyle's Law
Describes the relationship between pressure and volume
P ∝ 1 V
Pressure and volume are inversely related
Portrait of Jacques Charles

Source: Jacques Charles - Julien Léopold Boilly, Mu, Wikimedia Commons

Charles' Law
Describes the relationship between volume and temperature (in Kelvin)
V ∝ T
Volume and temperature are directly related
Portrait of Louis Joseph Gay-Lussac

Source: Gay-Lussac, Magnus Manske

Gay-Lussac's Law
Describes the relationship between pressure and temperature
P ∝ T
Pressure and temperature are directly related
Portrait of Amedeo Avagadro

Source: Amadeo Avogadro, Magnus Manske, Wikimedia Commons

Avogadro's Gas Law
Describes the connection between gas volume and number of moles
V1 n1 = V2 n2
The ratio of the number of moles of a gas to its volume is constant

Text: Ideal Gas Law

Because this law ties together the other gas laws, it has the following important components:

  1. If temperature and pressure are kept constant, then the volume of the gas is directly proportional to the number of molecules of gas.
  2. If the temperature and volume remain constant, then the pressure of the gas changes is directly proportional to the number of molecules of gas present.
  3. If the number of gas molecules and the temperature remain constant, then the pressure is inversely proportional to the volume.
  4. If the temperature changes and the number of gas molecules are kept constant, then either pressure or volume (or both) will change in direct proportion to the temperature.