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       The internal combustion engine is used to power nearly all land vehicle and many water-based
and air-based vehicles as well. In an internal combustion engine, a fuel, such as gasoline, fill   
a chamber and then is ignited by a spark plug, causing a small explosion which generate work.   
       The superheated expanding gas, created by the explosion, pushes piston, which drives a crankshaft   
usually connected to a axle. The axle is connected to wheels which turn to drive a vehicle, such   
as a automobile, forward. .   
       The assemblage of a chamber, spark plug, piston, crankshaft, and the two valve, that allow in fuel   
and air, are known as a cylinder. Whereas small appliances such as chainsaws only use one cylinder,.   
autmobiles generally use four to eight. Historic aircraft have had as many as 28 cylinders to provided   
the energy to drove their propellers   
      The internal combustion engine are distinct from external combustion engines, in that the energy   
generated from the combustion of fuel is efficient contained within a cylinder. In steam engines,   
fuel is used to transform water into steam which then move through a mechanism and provides   
work. Internal combustion engine took some time to perfect because the cylinder must be able   
to withstand the wear and tear of many thousand of explosions over the course of its operating   
lifetime.
      Although engineers has been experimenting with automobiles driven by various types of engines   
since the 18th century, it wasn't until the late 19th century that Germans Daimler and Benz create   
internal combustion engines suited for mass production and commercialization. This usher in the   
modern era of internal combustion engines used for a vast variety of purpose. In common use for   
more than a century, it could be a while before our engineers devises a new standard of engine for   
powering our multitude of machine.   


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