MEA 130 Chapter Notes - Chapter 6: Advection, Electrical Resistance And Conductance, Lapse Rate
18 Jan 2020
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What is atmospheric pressure: air pressure [p, the force (per unit area) exerted by the weight of a column of air above a given point (fig. 6. 1: the force is created by the continuous, collision of gas molecules (n2, o2, ar , at mean sea level (msl), the average p is, 14. 7 lbs in-2. Measuring atmospheric pressure: meteorological applications do not use lbs in-2; rather we use, inches of mercury (in hg): reported to the public, millibars (mbs): used by meteorologists, 1. 0 lbs in-2 = 2. 04 in hg = But, since water is much less (13. 6x) dense than hg, the height of the barometer would have to be much greater (13. 6x). So . a barometric pressure of 30. 00" hg would equal 408. 0" water (34") : aneroid barometer: consists of a small metal box called an aneroid (without liquid) cell that has had some of its air removed before sealing (fig.
