Air hoses are used in underwater diving

Underwater diving

Underwater diving is the practice of going underwater, either with breathing apparatus or by breath-holding .Recreational diving is a popular activity...

, such as scuba diving

Scuba diving

Scuba diving is a form of underwater diving in which a diver uses a scuba set to breathe underwater....

, to carry air from the surface

Surface

In mathematics, specifically in topology, a surface is a two-dimensional topological manifold. The most familiar examples are those that arise as the boundaries of solid objects in ordinary three-dimensional Euclidean space R3 — for example, the surface of a ball...

 or from air tank

Air tank

Air tank may refer to:* diving cylinder used by scuba divers to hold air and other breathing gases at high pressure underwater* Pneumatic pressure vessel for storing compressed air to operate pneumatic equipment such as braking systems, paint dispensers and paintball guns...

s or diving pumps to the diver. Air hoses are therefore a necessary part of standard diving dress

Standard diving dress

A standard diving dress consists of a metallic diving helmet, an airline or hose from a surface supplied diving air pump, a canvas diving suit, diving knife and boots...

 and any type of surface supplied diving

Surface supplied diving

Surface supplied diving refers to divers using equipment supplied with breathing gas using a diver's umbilical from the surface, either from the shore or from a diving support vessel sometimes indirectly via a diving bell...

 equipment.
They are an essential part of scuba diving equipment

Diving equipment

Diving equipment is equipment used by underwater divers for the purpose of facilitating diving activities. This may be equipment primarily intended for this purpose, or equipment intended for other puprposes which is found to be suitable for diving use....

, used to deliver pressurised air from the first stage of a diving regulator

Diving regulator

A diving regulator is a pressure regulator used in scuba or surface supplied diving equipment that reduces pressurized breathing gas to ambient pressure and delivers it to the diver. The gas may be air or one of a variety of specially blended breathing gases...

 to the other components.

Air hoses are used between locomotive

Locomotive

A locomotive is a railway vehicle that provides the motive power for a train. The word originates from the Latin loco – "from a place", ablative of locus, "place" + Medieval Latin motivus, "causing motion", and is a shortened form of the term locomotive engine, first used in the early 19th...

s and railroad car

Railroad car

A railroad car or railway vehicle , also known as a bogie in Indian English, is a vehicle on a rail transport system that is used for the carrying of cargo or passengers. Cars can be coupled together into a train and hauled by one or more locomotives...

s for their brakes, and are also used between those tractors

Tractor unit

A tractor unit, prime mover , road tractor, or traction unit is a heavy-duty commercial vehicle within the large goods vehicle category, usually with a large displacement diesel engine, and several axles. The tractor unit serves as a method of moving trailers...

 and semi-trailers which use air brakes

Air brake (road vehicle)

Air brakes are used in trucks, buses, trailers, and semi-trailers. George Westinghouse first developed air brakes for use in railway service. He patented a safer air brake on March 5, 1872. Originally designed and built for use on railroad train application, air brakes remain the exclusive systems...

.

Types of air hoses

• Air hose for surface supplied diving.
• Low pressure hoses connecting to a demand valve and for inflating drysuits and buoyancy compensators. These are designed to be used at pressures up to about 20 bar (2 MPa; 290.1 psi).
• High pressure hoses connecting to a pressure gauge. These have operating pressures in excess of 300 bar (30 MPa; 4,351.1 psi).

See also

• Hose (tubing)
  Hose (tubing)
  A hose is a hollow tube designed to carry fluids from one location to another. Hoses are also sometimes called pipes , or more generally tubing...
  
  
• Snorkel
• Standard diving dress
  Standard diving dress
  A standard diving dress consists of a metallic diving helmet, an airline or hose from a surface supplied diving air pump, a canvas diving suit, diving knife and boots...
  
  
• Surface supplied diving
  Surface supplied diving
  Surface supplied diving refers to divers using equipment supplied with breathing gas using a diver's umbilical from the surface, either from the shore or from a diving support vessel sometimes indirectly via a diving bell...