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Many years passed and people invented a new engine, one operated by steam. In a
steam engine, there is a furnace and a boiler. The furnace is filled with wood or
coal and then lit. The fire heats the water in the boiler and when it boils, it turns
into steam which does some useful work.
The more coal is put in the furnace, the stronger the fire is burning. The more
steam here is the faster a train or a boats moving.The steam engine drove all sorts
of machines, for example, steam ships and steams locomotives. Indeed, the very
first airplane built by A.F.Mozhaiskiy also had a steam engine. However, the steam
engine had its disadvantages. It was too large and heavy, and needed too much
fuel.
The imperfections of the steam engine led to the design of a new type. It was called
the internal combustion engine, because its fuel ignites and burns inside the engine
itself and not in a furnace. It is smaller and lighter than a steam engine because it
does not have a boiler. It is also more powerful, as it uses better-quality fuel: petrol
of kerosene.
The internal combustion engine is now used in cars, diesel locomotives and motor
ships. But to enable airplanes to fly faster than the speed of sound another, more
powerful engine was needed; Eventually, one was invented and it was given the
name "jet engine". The gases in it reach the temperature of over a thousand
degrees. It is made of a very resistant metal so that it will not melt.