Air pressure and altitude
5.1 Guidance
5.1.1 What is air pressure and altitude?
Air pressure, frequently referred to as atmospheric pressure, is ‘the force exerted on a surface of an area caused by the Earth’s gravitational attraction on the air vertically above that area’. Air pressure varies with altitude (i.e. elevation above mean sea level) and location. For instance at the equator where the tradewinds of both hemispheres converge, there is a low pressure zone (known as the ITCZ or International Conveyance Zone), which is characterised by high humidity.
5.1.2 Introduction
It is not widely appreciated that the location of equipment, especially with respect to its altitude above sea level, can affect the working of that equipment. ...
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