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In a car engine the fuel, which consists of carbon and hydrogen, is combined with oxygen from the air to produce carbon dioxide and water. Both these processes produce heat inside the cylinder, and they cause the gas in the cylinder to have an extremely high pressure.

Each pound of fuel used gives rise to about 3 pounds of carbon dioxide. The gain in mass comes from the oxygen taken from the atmosphere.

The gas pushes the piston down inside the cylinder, and it pushes the big-end via the con-rod to rotate the crankshaft. The energy is now mechanical energy and it goes along the transmission to the drive-wheels to propel the car forward.

Only about 20% of the energy in the fuel goes to drive the car. The rest is dissipated from the radiator, or else it goes out in the hot exhaust gases.

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9y ago
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Q: What energy Transfers Happen In A Car Engine?
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