Ideal Gas Definition

Definition of Ideal Gas

bottle with gas inside
At low temperature, real gases behave like ideal gases. Greenhorn1/wikimedia commons/public domain

Ideal Gas Definition

An ideal gas is a gas whose pressure P, volume V, and temperature T are related by the ideal gas law

PV = nRT,

where n is the number of moles of the gas and R is the ideal gas constant. Ideal gases are defined as having molecules with negligible size with an average molar kinetic energy dependent only on temperature. At low temperature, most gases behave enough like ideal gases that the ideal gas law can be applied to them.

Also Known As:

perfect gas

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Helmenstine, Anne Marie, Ph.D. "Ideal Gas Definition." ThoughtCo, Feb. 10, 2017, thoughtco.com/definition-of-ideal-gas-604532. Helmenstine, Anne Marie, Ph.D. (2017, February 10). Ideal Gas Definition. Retrieved from https://www.thoughtco.com/definition-of-ideal-gas-604532 Helmenstine, Anne Marie, Ph.D. "Ideal Gas Definition." ThoughtCo. https://www.thoughtco.com/definition-of-ideal-gas-604532 (accessed December 16, 2017).