Explain why the atmospheric pressure changes with altitude?

Explain why , atmospheric pressure decreases as we go higher up above the earth's surface.

Assertion : It is difficult to stop bleeding from a cut in the body at high altitudes. Reason : The atmospheric pressure at high altitude is lesser than the blood pressure.

In which region of the atmosphere , temperature decreases with altitudes ?

At higher altitudes, the atmospheric pressure is lesser as, at higher altitudes

Statement (S) : Cooking of food at high altitudes becomes difficult. Explanation (E) : The atmospheric pressure decreases and the boiling point of water is reduced at higher altitudes.

Our body is accustomed to high atmospheric pressure on ground. If we encounter, a low atmospheric pressure as is th case on high altitude we will experience the bursting of body cells, bleeding of nose and a high blood preussure. But in space, where astronauts dare to travel, atmospheric pressure does not exist at all. How do they cope with such condition?

What is meant by atmospheric pressure?