Final answer:
Fuel jettison is the process of discarding or dumping fuel from an aircraft or spacecraft. It is done in emergency situations or when the aircraft or spacecraft needs to reduce its weight for a safe landing. The fuel can be jettisoned as a liquid or solid, depending on the type of engine.
Step-by-step explanation:
Fuel jettison is the process of discarding or dumping fuel from an aircraft or spacecraft. This is typically done in emergency situations or when the aircraft or spacecraft needs to reduce its weight in order to land safely. The fuel can be jettisoned either as a liquid or as a solid, depending on the type of engine being used. For example, liquid-fueled engines may release a green flame, while solid-fueled engines may release a yellow flame.