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expansion

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expansion

In physics, the increase in size of a constant mass of substance caused by, for example, increasing its temperature (thermal expansion) or its internal pressure. The expansivity, or coefficient of thermal expansion, of a material is its expansion (per unit volume, area, or length) per degree rise in temperature.

In mechanics, expansion refers to the increase in volume of steam in the cylinder of a steam engine after cutoff, or of gas in the cylinder of an internal-combustion engine after explosion. See also Charles's law.


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Every step which she took toward relieving herself from obligations added to her strength and expansion as an individual.
At its utmost expansion in the full grown whale, the tail will considerably exceed twenty feet across.
BY a little after noon on the eve of Christmas, John had left his portmanteau in the cloak-room, and stepped forth into Princes Street with a wonderful expansion of the soul, such as men enjoy on the completion of long-nourished schemes.
 
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