what's the difference between a jet engine and a rocket?

Answer 1

A rocket carries its own air supply (oxidizer). A jet uses the atmosphere for its air supply.

Besides the basic reactive thrust of Jet engine, there are two variants, Turbo prop and Turbo Shaft. Both of these use power takeoff to drive propellers or rotor blades of an air craft.

Answer 2

A jet engine uses air, compresses it, and ignites it with fuel to expand it and thrusts it out the back to make a thrust force. A rocket engine uses the pure burning of fuel, without an air mixture, to propel itself. That's why the shuttle or a missile doesn't need an air intake like jet engines on planes do. Edit: my apologies, I meant that a rocket engine can be used in space, and yes it would still need oxygen mixture.

Answer 3

A jet engine is an engine that discharges a fast moving jet of fluid to generate thrust in accordance with Newton's third law of motion. This broad definition of jet engines includes turbojets, turbofans, rockets, ramjets, pulse jets and pump-jets, but in common usage, the term generally refers to a gas turbine Brayton cycle engine, an engine with a rotary compressor powered by a turbine, with the leftover power providing thrust. Jet engines are so familiar to the modern world that gas turbines are sometimes mistakenly referred to as a particular application of a jet engine, rather than the other way around. Most jet engines are internal combustion engines but non combusting forms exist also.

A rocket is a vehicle, missile or aircraft which obtains thrust by the reaction to the ejection of fast moving fluid from within a rocket engine.

The history of rockets goes back to at least the 13th century[1]. By the 20th century it included human spaceflight to the Moon, and in the 21st century rockets have enabled commercial space tourism.

Rockets are used for fireworks and weaponry, as launch vehicles for artificial satellites, and for human spaceflight and exploration of other planets. While they are inefficient for low speed use, they are, compared to other propulsion systems, very lightweight, enormously powerful and can achieve extremely high speeds.

Chemical rockets operate by expanding hot exhaust gas made from propellant against the inside of a bell nozzle, this generates forces that both accelerate the gas to extremely high speed, as well as, since every action has an equal and opposite reaction, generating a large thrust on the rocket.

Chemical rockets contain a large amount of energy in an easily liberated form, and can be very dangerous, although careful design, testing, construction and use can minimize the risks.

Answer 4

Charlie4 was a little off about the rocket. It does not use air but it does not use "pure" fuel. A rocket still needs an oxidizer. Usually liquiid oxygen. There are some exotic fuels which do not use Oxygen but other chemical reactions. Most solid fuel rockets have the oxidizer mixed in with thefuel and it is released as the fuel burns.
There are "rocets which do not burn fuel as well but use compressed gas but these are limited and are usually used for small adjustments in direction not propulsion.

Answer 5

in simple terms, a rocket is much quicker than a jet engine