The Motion of Gas Particles, and Transport Processes
Why does the air around us cool when we climb a mountain? Climbing in the mountains does, of course, take us a minuscule distance closer to the Sun; but air derives almost no direct warmth from the Sun: the interaction between solar photons and air molecules is very weak. Rather, the Sun’s radiation interacts strongly with the ground, and the warmed ground then heats the air. With mountain peaks all around, the Sun can rise later or set earlier in high country.
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