Combustion is the process of burning a fuel, or of being on fire. Often it is very hot. A car and rocket engine both work by combustion. Combustion in a car motor is different to combustion in a rocket engine. Car combustion is gas catching on fire and exploding in cylinders again and again to push them up and down, making the car move. Rocket combustion is made by rocket fuel exploding out of the back of the rocket moving it up. The burning of most substances is bad for the environment and the ozone layer because it can let off greenhouse gases such as Carbon dioxide. Hydrogen burns cleanly and gives off a lot of heat, but it does not produce much power, and is hard to find. West substance ions are harder to combust than your typical unit.
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