Everything about Physical Compression totally explained
Physical compression is the result of the subjection of a material to
compressive stress, resulting in reduction of
volume. The opposite of compression is
tension.
Explanation
Compression has many implications in
material science,
physics and
structural engineering, for compression yields noticeable amounts of
stress and
tension.
By inducing compression, mechanical properties such as
compressive strength or
modulus of elasticity, can be measured.
Scientists may utilize press machines to induce compression.
In engines
Internal combustion engine
In
internal combustion engines it's a necessary condition of economy to compress the explosive mixture before it's ignited: in the
Otto cycle, for instance, the second stroke of the piston effects the compression of the charge which has been drawn into the cylinder by the first forward stroke.
Steam engines
The term is applied to the arrangement by which the exhaust valve of a
steam engine is made to close, shutting a portion of the exhaust steam in the
cylinder, before the stroke of the piston is quite complete. This steam being compressed as the stroke is completed, a cushion is formed against which the
piston does work while its velocity is being rapidly reduced, and thus the stresses in the mechanism due to the inertia of the reciprocating parts are lessened. This compression, moreover, obviates the shock which would otherwise be caused by the admission of the fresh steam for the return stroke.
Further Information
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