ENVIRSC 1C03 Lecture Notes - Lecture 2: Ideal Gas Law, Density Of Air, Barometer
18 Jan 2017
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Lecture 2 atmosphere: pressure, density, and composition. Outline: real - world situations, atmospheric pressure, air density, relation with temperature, the ideal gas law. Atmospheric density and relation to atmospheric pressure. As climber gets higher up the mountain there will be less air available to them. Most air molecules on earth are close to earth"s surface pulled by gravity. Atmospheric pressure = force/ area (which is really weight over a certain area) Weight = m x g = 10, 339. 3 kg x 9. 8m/s-2 = 101,325 kg m/s-2 = 101,325 n. Pressure = force/area = 101, 325 n m-2 = 101, 325 pa = 101. 325 kpa = 1013. 25 hpa. Greater amount of overlying air means higher atmospheric pressure. Air pressure: decreases with climb of altitude. With rising altitude, the greatest drop occurs near the surface. One city is warmer, column of air is going to be expanding. Another city is colder, column of air is compressed.
