Every 1000 metres increase in altitude reduces atmospheric pressure - and hence the density of the air - by about 11 per cent (though the precise formula is more complicated than this).

海拔每上升1000米大气压力- - -也就是空气密度- - -会降低大概11%(虽然精确的公式比这要更复杂。)

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The SPRD is used on zone systems when the automatic closing of various zone dampers can create an excessive increase in air pressure and velocity throughout the duct system.

SPRD旁通阀是当各种区域风门自动关闭时用在区域系统中，可以在管道系统中增加空气压力盒速度。

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Air accumulation in the condenser owing to insufficient output of air extractor can increase the terminal temperature difference and the air pressure component.

抽气器出力不足而引起的空气在凝汽器内积聚，使得凝汽器端差和空气分压力均增大，对凝汽器真空造成双重影响。

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The strength of the high-tech material allows airlines to raise cabin air pressure and increase humidity, which should make passengers more comfortable on long flights.

ECONOMIST: Cabin fever