ground-level pressure

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• Above ground level — In aviation and atmospheric sciences, an altitude is said to be above ground level (AGL) when it is measured with respect to the underlying ground surface. This is as opposed to above mean sea level (AMSL), or in broadcast engineering, height… …   Wikipedia

• ground-boosted engine — An aircraft reciprocating engine with a built in supercharger or turbocharger that boosts the manifold pressure well above sea level pressure to achieve the rated horsepower of the engine …   Aviation dictionary

• Level sensor — Level sensors are used to detect liquid level. The liquid to be measured can be inside a container or can be in its natural form (e.g. a river or a lake). The level measurement can be either continuous or point values. Continuous level sensors… …   Wikipedia

• Ground proximity warning system — (GPWS) is a system designed to alert pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. Another common name for such a system is ground collision warning system (GCWS). Commercial aircraft The system… …   Wikipedia

• Ground effect in aircraft — Aircraft may be affected by a number of ground effects, aerodynamic effects due to a flying body s proximity to the ground.One of the most important of these effects is the Wing In Ground effect, which refers to the reduction in drag experienced… …   Wikipedia

• level — {{Roman}}I.{{/Roman}} noun 1 amount/size/number ADJECTIVE ▪ elevated, high, significant, substantial ▪ record ▪ Industrial output has reached record levels. ▪ …   Collocations dictionary

• Ground effect vehicle — A ground effect vehicle, wing in ground effect vehicle (WIG), flarecraft, sea skimmer, ekranoplan, or wing in surface effect ship (WISE) is a vehicle that attains level flight near the surface of the Earth, made possible by a cushion of high… …   Wikipedia

• Pressure measurement — The construction of a bourdon tube gauge, construction elements are made of brass Many techniques have been developed for the measurement of pressure and vacuum. Instruments used to measure pressure are called pressure gauges or vacuum gauges. A… …   Wikipedia

• ground — ground1 [ graund ] noun *** ▸ 1 surface of Earth ▸ 2 area of land ▸ 3 reason for something ▸ 4 subject/idea ▸ 5 someone s set of opinions ▸ 6 level of progress ▸ 7 crushed coffee beans ▸ 8 in electrical equipment ▸ 9 where ideas develop ▸ 10… …   Usage of the words and phrases in modern English

• ground — I UK [ɡraʊnd] / US noun Word forms ground : singular ground plural grounds *** 1) [singular/uncountable] the top part of the Earth s surface that people walk on I fell to the ground. on the ground: People were sitting on the ground in small… …   English dictionary

• ground*/*/*/ — [graʊnd] noun I 1) [singular/U] the top part of the Earth s surface that people walk on People were sitting on the ground in small groups.[/ex] They were working 250 metres below ground.[/ex] 2) [singular] the layer of soil and rock that forms… …   Dictionary for writing and speaking English