ATOC 184 Lecture Notes - Lecture 4: Vapor Pressure, Dew Point
20 Jan 2019
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Document Summary
Pressure is the force exerted on a particular area. Air pressure can be changed in 2 ways. Increase number of molecules -> increases number of collisions. Unless being prevented from doing so, molecules will move from high pressure to low pressure regions. Gravity pulls on the air molecules to bring down to surface. Eventually, there is such a great amount of air molecules that the pressure is so great it"s upwards force towards the low pressure area is so great it equals the force of gravity. Standard pressure at sea-level is 1013 hpa. Temperatures near the ground is higher then up in the atmosphere. The warmer that an area is, the more spread out the molecules are at those areas. The warmer temperature means less molecules are required the maintain hydrostatic equilibrium. Atmosphere is thicker where it is warmer compared to colder. Vapour pressure is pressure produced by water vapour. Measure of the absolute amount of moisture in the air.
