A jet engine is a reaction engine that discharges a fast moving jet of fluid to generate thrust in accordance with Newton's laws of motion. This broad definition of jet engines includes turbojets, turbofans, rockets, ramjets, pulse jets & pump-jets. In general, most jet engines are internal combustion engines but non-combusting forms also exist.
In some common parlance, the term 'jet engine' is loosely referred to an internal combustionduct engine, which typically consists of an engine with a rotary (rotating) air compressor powered by a turbine with the leftover power providing thrust via a propelling nozzle. These types of jet engines are primarily used by aircrafts for long distance travel. The early jet aircraft used turbojet engines which were relatively inefficient for subsonic flight. Modern subsonic jet aircraft usually use high bypass turbofan engines which help give high speeds as well as, over long distances, giving better fuel efficiency than many other forms of transport.
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