bulk modulus

bulk modulus

noun Physics.
a coefficient of elasticity of a substance, expressing the ratio between a pressure that acts to change the volume of the substance and the fractional change in volume produced.

Origin:
1905–10
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bulk modulus is always a great word to know.
So is positron. Does it mean:
the transfer of heat between two parts of a stationary system, caused by a temperature difference between the parts
a particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron's negative charge
Collins
World English Dictionary
bulk modulus
 
n
K a coefficient of elasticity of a substance equal to minus the ratio of the applied stress (p) to the resulting fractional change in volume (dV/V) in a specified reference state (dV/V is the bulk strain)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
bulk modulus   (bŭlk)  Pronunciation Key 
See under modulus of elasticity.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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