EAPS 10200 Lecture Notes - Lecture 1: Barometer, Pressure-Gradient Force, Coriolis Force
23 Oct 2017
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Document Summary
Force of combined weight of all the air molecules above a surface. # of air molecules decreases with altitude. Result of many collisions that air particles make with all surfaces. Moving air particles collides with surface it imparts a force on that surface. Air pressure is felt all around the object. Invert tube vertically in dish of mercury. Air pressure the mercury up the rube and mercury pushing down in tube are equal, the height of the mercury in the tube above the mercury in the dish s the air pressure in mm of hg. Partially evacuated metal chamber that is sensitive to changes in air pressure. As chamber expands and contracts with air pressure, a sweeps of levers and springs connect chamber to calibrated dial. Warm air rises and cold air sinks resulting in verti(cid:272)al (cid:373)ove(cid:373)e(cid:374)t of air (cid:271)ut also creates horizontal movement of air too called wind.
