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van der Waals' equation

[van der wahlz, wawlz; Dutch vahn duh r vahls] /ˈvæn dər ˌwɑlz, ˌwɔlz; Dutch ˌvɑn dər ˈvɑls/
noun, Thermodynamics
1.
an equation of state relating the pressure, volume, and absolute temperature of a gas, taking into account the finite size of the molecules and the attractive force between them.
Also, van der Waals equation.
Origin
named after J. D. van der Waals (1837-1923), Dutch scientist
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for van der waals equation

van der Waals equation

/ˈvæn də ˌwɑːlz/
noun
1.
an equation of state for a non-ideal gas that takes account of intermolecular forces and the volume occupied by the molecules of the 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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van der waals equation in Science
van der Waals equation  
An equation that relates the pressure, volume, and absolute temperature of a gas taking into account the finite size of molecules, and their intermolecular attraction, having the form RT = (P + av-2)(v - b), where R is the gas constant, T is the absolute temperature, P is the pressure, v is the volume of fluid per molecule, a is a measure of the attraction of the molecules for each other (due to van der Waals forces), and b is the volume occupied by a single molecule. The equation accurately captures phase transitions between liquid and gas phases of substances. See also ideal gas law.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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