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| the property of a system that diminishes when the system does work on any other system, by an amount equal to the work so done |
| the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum |
| coefficient of expansion | |
| —n | |
| Also called: expansivity the amount of expansion (or contraction) per unit length of a material resulting from one degree change in temperature | |