Nozzles may be described when convergent (narrowing down from either the wide across to the little across in the counsel of the flow) or even diverging (expanding from either the little across to the big of these). A select few nozzles come combinations of each—for instance, rocket engines and supersonic jet engines use the nozzle that is commonly described as a CD nozzle (for convergent-divergent) first narrowing to the "throat" so expanding once more into the "bell".

the project of an nozzle potty drastically affect a efficiency of a rocket engine. A shape of a nozzle determines how else with efficiency a expansion of a exhaust gases is converted into linear motion; particularly this determines the exhaust speed & so the specific impulse. E.g., the optimum shape of a rocket nozzle depends on the ambient pressure; for rockets travelling from either the Globe to orbit, a elementary nozzle project is sole optimum at one altitude, losing efficiency & wasting fuel at more altitudes. a total of sophisticated designs own been proposed, like the expanding nozzle, the aerospike, and a plug nozzle which adapt in some way to changing ambient pressure.

Magnetic nozzles have besides been proposed for a bit of types of propulsion, where a flow of plasma is directed by magnetic fields instead of walls processed of firm matter.

Inside a select few areas of Scotland, the nozzle may refer to the nose.

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