Combined gas law

The combined gas law states that, for a fixed amount of gas, pressure multiplied by volume and divided by absolute temperature remains constant.

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Boyle's law: For a fixed amount of gas at constant temperature, pressure and volume are inversely proportional. It describes the pressure–volume relationship when temperature is held fixed.
Pressure: Force exerted per unit area by particles colliding with a surface. Pressure is one of the three state variables combined in the relation.
Gas laws: Relations describing how gas pressure, volume, temperature, and amount depend on one another. The combined gas law unifies several simpler gas-law relationships.
Avogadro's law: At fixed pressure and temperature, a gas's volume is proportional to its amount of substance. Unlike the combined gas law, it describes changes in gas amount.
Charles's law: For a fixed amount of gas at constant pressure, volume is directly proportional to absolute temperature. It gives the volume–temperature relationship when pressure is held fixed.
Volume: The three-dimensional space occupied by a substance or system. Volume is the spatial variable whose changes are related to pressure and temperature.
Standard temperature and pressure: A reference condition for gases defined by specified standard values of temperature and pressure. Gas volumes are often compared across states using pressure and temperature corrections.
van der Waals equation: An equation of state that corrects the ideal gas law for molecular attraction and finite particle volume. It handles nonideal behavior omitted by the combined gas law.
Gay-Lussac's law: For a fixed amount of gas at constant volume, pressure is directly proportional to absolute temperature. It gives the pressure–temperature relationship when volume is held fixed.
Temperature: A physical quantity that characterizes thermal state and determines the direction of heat transfer. The formula uses temperature on an absolute scale, not an arbitrary scale.