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Expansion

A given amount of steam will naturally attempt to expand into a space. If that space is a cylinder occupied by a piston, the steam will push the piston until it can expand no further. In a steam engine, the steam is admitted into the cylinder for a time until the supply is cut off. The admission of steam pushes the piston until the admission is cut off, after which time the steam naturally expands and continues to push the piston. The two phases are known as 'admission' and 'expansion'. The point at which admission stops and expansion commences is known as cut off.

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  • Part of Speech: noun
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  • Category: Railway
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