Generally speaking, I understand why hot air rises and cold air falls. Gravity causes cold air, which weighs more than hot air, to be pushed down. But there a lot of situations where I have a hard time understanding how this concept applies.
For example, it makes sense that roofing is a hot job, since hot air rises in a house up to the roof (and also because the sun shines on a roof more directly and a roof is often black which makes it reflect sunlight as heat). But why does it feel so much cooler at the top of a mountain than at the bottom?
How can it be so cold at an altitude of several thousand feet that airplanes need ice protection systems, since at higher altitudes one is closer to the sun? And how can we make sense of the fact that the temperature a few feet deep in the ground stays ~50°F year round, but down in the core of the earth it is extremely hot?
For example, it makes sense that roofing is a hot job, since hot air rises in a house up to the roof (and also because the sun shines on a roof more directly and a roof is often black which makes it reflect sunlight as heat). But why does it feel so much cooler at the top of a mountain than at the bottom?
How can it be so cold at an altitude of several thousand feet that airplanes need ice protection systems, since at higher altitudes one is closer to the sun? And how can we make sense of the fact that the temperature a few feet deep in the ground stays ~50°F year round, but down in the core of the earth it is extremely hot?