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Combined gas law.

The combined gas law is a gas law that combines Charles's law, Boyle's law, and Gay-Lussac's law. There is no official founder for this law; it is merely an amalgamation of the three previously discovered laws. These laws each relate one thermodynamic variable to another mathematically while holding everything else constant. The combined gas law clearly states that: the ratio between the pressure-volume product and the temperature of a system remains constant. This can be stated mathematically as

where:

P is the pressure

V is the volume

T is the temperature measured in kelvin

k is a constant (with units of energy divided by temperature).

For comparing the same substance under two different sets of conditions, the law can be written as:

The addition of Avogadro's law to the combined gas law yields the ideal gas law.If five of these quantities are given, the sixth may be calculated. Temperatures must be expressed in kelvins, and the units of pressure and of volume must be the same on both sides of the equation.