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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.
Being a non-carbon fuel, the exhaust is free of carbon dioxide. Carbon dioxide, emitted from our burning of fossil fuels, is causing the world's climate to change. Hydrogen is normally a gas and can be compressed and stored in cylinders.ydrogen-a very special type of gas. Liquefied natural gas (LNG) - natural gas that is very, very cold. Liquefied petroleum gas (LPG) - hydrocarbon gases under low pressure. Liquids made from coal-gasoline and diesel fuel that doesn't come from petroleum.