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WordReference Random House Unabridged Dictionary of American English © 2024ide′al gas′, [Physics.]- Physicsa gas composed of molecules on which no forces act except upon collision with one another and with the walls of the container in which the gas is enclosed;
a gas that obeys the ideal gas law. Also called perfect gas.
Collins Concise English Dictionary © HarperCollins Publishers:: ideal gas n - a hypothetical gas which obeys Boyle's law exactly at all temperatures and pressures, and which has internal energy that depends only upon the temperature. Measurements upon real gases are extrapolated to zero pressure to obtain results in agreement with theories relating to an ideal gas, especially in thermometry
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