low (high) pressure

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• high-pressure phenomena — ▪ physics Introduction       changes in physical, chemical, and structural characteristics that matter undergoes when subjected to high pressure. pressure thus serves as a versatile tool in materials research, and it is especially important in… …   Universalium

• High pressure area — A high pressure area (also called a high or high pressure) is a region where the atmospheric pressure is greater than surrounding areas. In the northern hemisphere high pressure areas move clockwise, whereas they move counter clockwise in the… …   Wikipedia

• High pressure steam locomotive — A high pressure steam locomotive is a steam locomotive with a boiler that operates at pressures well above what would be considered normal. In the later years of steam, boiler pressures were typically 200 to 250 PSI (1.4 to 1.7 MPa). High… …   Wikipedia

• High-pressure steam — Steam Steam (st[=e]m), n. [OE. stem, steem, vapor, flame, AS. ste[ a]m vapor, smoke, odor; akin to D. stoom steam, perhaps originally, a pillar, or something rising like a pillar; cf. Gr. sty ein to erect, sty^los a pillar, and E. stand.] 1. The… …   The Collaborative International Dictionary of English

• high-pressure — adjective a) Operating with high pressures, such as several times atmospheric pressure but relative. High pressure situations either make diamonds or nervous breakdowns. b) Tense, stressful. Ant: low pressure …   Wiktionary

• high-pressure fuel system — That part of the aircraft’s overall fuel system that starts after the entry of fuel into the engine. An HP pump (high pressure pump) takes fuel from the low pressure, or aircraft, fuel system and raises its pressure sufficiently to ensure an… …   Aviation dictionary

• high pressure foaming — A process in which plastics are foamed under high pressure (6 50 bar). The opposite is low pressure foaming …   Dictionary of automotive terms

• low head pressure — Lower than normal high side pressure caused by a system malfunction …   Dictionary of automotive terms

• low-suction pressure — Condition of lower than normal high side pressure caused by system malfunction …   Dictionary of automotive terms

• ridge of high pressure — A ridge is an area of high pressure that does not have a closed circulation; it either extends from a high pressure area or is sandwiched between a couple of lows. More often than not, a ridge of high pressure divides two low pressure areas. It… …   Aviation dictionary

• tongue of high pressure — A pressure system dividing two low pressure areas. It also may be indicated by isobars extending from a high and is always rounded, never V shaped as sometimes occurs in a trough of low pressure. Also known as a wedge of high pressure or a ridge… …   Aviation dictionary