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ideal gas

noun, Physics.
a 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.
Origin of ideal gas
1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for ideal gas
  • Use the ideal gas law to determine gas volumes at different absolute temperatures and absolute pressures.
  • As such, it is no longer a gas and it cannot behave in accordance with the ideal gas laws.
  • Introducing units of time to the ideal gas law shows the relationship between volumetric and molar flow rates.
  • The ideal gas law will dictate pressure, temperature, and volumes dependant on one another.
  • The heat capacity of the ideal gas reference state is determined from sound speed measurements on the low density vapor.
  • For an atomic ideal gas, there is no vibrational or rotational motion.
British Dictionary definitions for ideal gas

ideal gas

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 Also called perfect gas
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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ideal gas in Medicine

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ideal gas in Science
ideal gas
A hypothetical gas whose molecules bounce off each other (and the boundaries of their container) with perfect elasticity and have negligible size, and in which the intermolecular forces acting between molecules not in contact with each other are also negligible. Such a gas would obey the gas laws (such as Charles's law and Boyle's law) exactly at all temperatures and pressures. Most actual gases behave approximately as ideal gases, except at very low temperatures (when the potential energy of their intermolecular forces is high relative to the kinetic energy of the molecules and becomes significant), and under very high pressures (when the molecules are packed so close together that close-range intermolecular forces become significant).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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