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van der Waals force
(redirected from van der Waal's forces)

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia 0.01 sec.
van der Waals force (vn dr wôlz, wälz)
n.
A weak attractive force between atoms or nonpolar molecules caused by an instantaneous dipole moment of one atom or molecule that induces a similar temporary dipole moment in adjacent atoms or molecules.


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These layers interact with each other by van der Waal's forces along the crystallographic a-direction.
Also, the attempt to use science to give "phase angle" or "tan delta" would apply to the spring and dashpot model, but cannot be used for the viscoelastic model of a rubber where the viscosity is due to the need to do work to move neighboring elements held attracted by Van der Waal's forces and elasticity is the entropy effect of stretched chains returning to a random configuration.
With nonpolar atoms or molecules, weak attractions called van der Waal's forces lead to the capillary action, Broughton says.
 
 
 
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