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Page 8
Internal combustion engines use gas compression as well.
The engine pulls gasoline into a tube with a moving piston.
The tube, when the piston is in place, is airtight, so as the piston rapidly compresses the gas, it causes the gasoline to ignite just like the Fire Syringe did with the wool.
The ignition suddenly causes the volume of the gas to expand rapidly (it explodes) and quickly moves the piston.
The piston's movement then moves gears that cause parts to rotate and then turn the wheels, etc. You can see this in action at the following link: http://www.animatedengines.com/
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