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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A gas that, when kept at a constant temperature, would obey the gas laws exactly. No known gas is an ideal gas.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a hypothetical gas, whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a hypothetical gas with molecules of negligible size that exert no intermolecular forces


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