Jet nozzles are used to eject either gas or fluid in a stream. Jet nozzles are typically gas, as found in a gas stove or oven; or fluid, such as a water nozzle or a jacuzzi jet; or hydro, which is used as a suction force which channels water to a different location.
A propelling nozzle is used to force air through a high-speed nozzle, which propels to increase its kinetic energy (an object's energy in motion). Rocket motors use propelling nozzles to increase thrust and exhaust velocity to employ high nozzle pressure ratios.
Spray nozzles are the most common type of nozzle, used for surface coating, washing, humidification, chemical reactions, combustion and various other uses. Spray nozzles may be hydraulic (operating under pressure through a small opening), air-assisted (using high-speed air to form atomization) or ultrasonic (driven by an electronic power generator through a titanium nozzle).
Vacuum nozzles are used as a suction cleaning force. Various nozzles affect the force of the suction or the size of the nozzle to suction hard-to-reach crevices.