van der Waals equation


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van der Waals equation

n.
An equation of state 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, and a and b are constants.

[After Johannes Diderik van der Waals.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

van der Waals equation

(ˈvæn də ˌwɑːlz)
n
(General Physics) 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 and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
Comparing with the van der Waals equation, the specific volume is defined as [14]
This is true for SRK and PR, but not for the van der Waals equation of state, which has the constants [[DELTA].sub.1] = [[DELTA].sub.2] = 0.
His topics include the first three laws of thermodynamics, the structure of thermodynamic theories, thermodynamic potentials and Maxwell relations, the van der Waals equation, the approach to absolute zero, and some mathematical aspects of thermodynamics.
The mass difference in the pan can be translated into different pressure using the van der Waals equation.
Angell notes that the van der Waals equation -- an enduring 19th-century formula describing gas behavior -- predicts that liquids must break up and form vapor bubbles when stretched beyond a point at which their molecules hover between liquid and vapor states.
A discussion of Dalton's Law of Partial Pressure and the van der Waals equation showing how poorly these predict real behaviour can be a useful experience for the students.
To compare with the van der Waals equation, we set [P.sub.eff] [right arrow] P, v [right arrow] v and discuss the phase transition and the critical phenomena when [r.sub.c] is invariant.
As mentioned previously, the 2-domain Tait equation and the Van Der Waals equation of state were the equations chosen in this work for the polymer and gas, respectively.