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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.
What is released into the atmosphere by the burning of fossil fuels? Carbon from coal combines with oxygen in the air to form carbon dioxide. This is a primary gas released during the burning of all fossil fuels. The oxidation reduction of hydr â¦ ocarbon chains of oil also result in the release of some water vapor at about equal volume to carbon dioxide.