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the cylinder (known as Bottom Dead Centre or BDC) the exhaust valve starts to open. As the piston now moves up the cylinder, the hot gases (consisting mostly of nitrogen, carbon dioxide, water vapour and unused oxygen) are expelled from the cylinder. As the Piston approaches TDC again the inlet valve starts to open and the cycle repeats itself.
piston chamber; cylinder. Hypernyms (cylinder is a kind of...): chamber (a natural or artificial enclosed space) Meronyms (parts of cylinder): intake valve (a valve that controls the flow of fluid through an intake) Hyponyms (each of the following is a kind of cylinder): brake cylinder; hydraulic brake cylinder; master cylinder (a cylinder that contains brake fluid that is compressed by a piston) Holonyms (cylinder is a part of...):