Edit thanks everyone, I’m not sure why I wasn’t understanding but you’ve all clarified it for me
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Solid rocket fuel is typically used in rockets and missiles.
Missiles like the AMRAAM and Sidewinder use Solid fuel, and the Space Shuttles two outer boosters were solid fuel.
As the name implies it is a solid at room temperature as opposed to a compressed liquid like Hydrogen.
The chemicals include both fuel and oxidizer and are pre-mixed and harden into a solid at room temperature. This makes it safe to handle and relatively stable. The solid is molded into the rocket tube leaving a gap in the center for the exhaust to form and escape.
When ignited the material burns from the top of the missiles down to the ~~nose cone~~ nozzle producing thrust.
A typical mix includes ammonium perchlorate (70%), aluminium (16%) and binder (14%). The aluminum being the fuel.
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