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Any form of diving in which air is supplied under high pressure to prevent lung collapse.

Related Terms


A blasting technique in which air at very high pressure is piped to a steel shell in a shot hole and discharged. Also known as air breaking.


A sprinkler like device which is used with high pressure to clean the inside of cargo tanks. One famous brand name is 'butterworth'. Therefore when a tank is butterworthed it is being cleaned.


A hydraulic device that converts a large volume low pressure oil supply to a small volume, high pressure output. Also known as intensifier.


The regions of calms and variable winds coinciding with the subtropical high pressure belts on the poleward sides of the trade winds. The expression is generally applied only to the northern of these two regions in the North Atlantic Ocean, or to the portion of it near Bermuda.


A fire fighting device consisting of a cylindrical vessel containing carbon dioxide under high pressure with a release trigger and discharge horn.


A plunger type pump designed to inject fuel at high pressure into the cylinder of diesel engines.


A removal of all traces of a cargo from the tanks of a tanker normally by means of high pressure water jets.


A silicate material used with high pressure gauge glasses on boilers.


The winds associated with a high pressure area and constituting part of an anticyclone


A northerly wind. In the southern United States, especially in Texas (Texas norther) in the Gulf of Mexico, in the Gulf of Panama away from the coast, and in central America (the norte), the norther is a strong cold wind from the northeast to northwest. It occurs between November and April, freshening during the afternoon and decreasing at night. It is a cold air outbreak associated with the southward movement of a cold anticyclone. It is usually preceded by a warm and cloudy or rainy spell with southerly winds. The norther comes as a rushing blast and brings a sudden drop of temperature of as much as 25°F in 1 hour or 50°F in 3 hours in winter. The California norther is a strong, very dry, dusty, northerly wind which blows in late spring, summer and early fall in the valley of California or on the west coast when pressure is high over the mountains to the north. It lasts from 1 to 4 days. The dryness is due to adiabatic warming during descent. In summer it is very hot. The Portuguese norther is the beginning of the trade wind west of Portugal. The term is used for a strong north wind on the coast of Chile which blows occasionally in summer. In southeast Australia, a hot dry wind from the desert is called a norther.

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