Why is the air rising even more cold?

We know that hot air is lighter and floats up, so why is it so cold on the top of the mountain?

Imagine this: the ground is a giant fireplace that keeps us warm and the further we go from this fireplace the more we feel cold.

So what heats this heater? That is the light and the heat radiating from the Sun. Scientists call light and the heat of the sun radiating 'radiation'.

The air above could barely hold the heat emanating from the Sun and the heat only passed through it and onto the ground.

Light and heat from the Sun go through space to Earth, through Earth's atmosphere.

But the atmosphere cannot keep the Sun's light and heat alive. Heat only passes through the atmosphere. When the sun's heat reaches the ground, it is absorbed by the ground. The forests and the sea are even more absorbing. Other places like snowy areas tend to reflect the sun's heat radiation.

The higher you go, the farther away you are from the 'fireplace' on the ground, and up to the top of the mountain is very cold, with high peaks so cold that people can die in less than an hour if not Keep warm enough. That's because the air at such a high level keeps the heat from the Sun very poor, but the heat just goes through it to the ground .

In the distant universe there is a lot of radiation from the Sun, and astronauts must wear special clothing to protect it from radiation. But there is no air in the universe, which means there is almost nothing to retain the heat from the Sun and so you will not feel warm if you fly up there. So if you accidentally fly to space without special protective clothing, you will be frozen to death.

1. Why should the plane fly higher than the Everest peak?
2. Why does the wind look stronger than usual when standing near tall buildings?