第18届国际物理奥林匹克竞赛试题及解答（英文）

Theoretical Problems
Problem 1: Ascending moist air
Moist air is streaming adiabatically across a mountain range as indicated in the figure. Equal atmospheric pressures of 100 kPa are measured at meteorological stations M0 and M3 and a pressure of 70 kPa at station M2. The temperature of the air at M0 is 20° C.
As the air is ascending, cloud formation sets in at 84.5 kPa.
Consider a quantity of moist air ascending the mountain with a mass of 2000 kg over each square meter. This moist air reaches the mountain ridge (station M2) after 1500 seconds. During that rise an amount of 2.45 g of water per kilogram of air is precipitated as rain.











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