More bounce per ounce of fuel..
Traditionally, rockets use cryogenic (super-cold) oxygen and hydrogen.
Rocket engine
Liquid hydrogen and liquid oxygen
- tempering remain a mystery to most people in industry.
The engine mount holds the engine in place.
cast aluminum
A cryogenic engine is important because it will carry heavy payloads to geosynchronous transfer orbit. This is highly essential for future telecommunication and space exploration. It is able to carry up to five tons compared to the 1.5-ton payload capacity of PSLVs.
cryogenic metal treatment
Model rockets can use anything from 1/4A to G engines.Amateur rockets can use up to N engines.Professional rockets have no limit.Each successive engine letter has twice the power of the previous. Assuming Professional rockets start with O engines, the smallest Professional rocket engine has 256 times the power of the largest Model rocket engine. Most will of course be much larger.
To launch the rocket off the ground and make it go fast.
cryogenic :)
The question is ambiguous as to an advantage over what, but rockets are extremely fast, technically straight-forward when compared to jet engines or internal combustion machines, and can function in a vacuum. Depending on alternatives, they can also be cheaper.