|MLA Citation:||Bloomfield, Louis A. "Question 541"|
How Everything Works 19 Jan 2018. 19 Jan 2018 <http://howeverythingworks.org/print1.php?QNum=541>.
The origin of the large pressure around us is the weight of the atmosphere overhead. The air near you is supporting the weight of several miles or kilometers of air overhead and the weight of this air is squeezing the air down here. When you ascend a mountain, the amount of air overhead decreases and so does the pressure of the air around you. Your body becomes less tightly squeezed by the air around it. However, you don't explode because releasing the pressure on you doesn't change your volume very much. Solids and liquids don't expand very much when the pressure on them is released.