Why Aren't We Crushed by the Massive Amount of Air Above Us?

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Discussion Overview

The discussion revolves around the question of why humans are not crushed by the weight of the atmosphere above them, despite the significant mass of air present. Participants explore concepts related to air pressure, forces acting in multiple directions, and the behavior of gas molecules, touching on theoretical and conceptual aspects of physics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Homework-related

Main Points Raised

  • Some participants suggest that the reason we are not crushed is due to Newton's third law, where the forces from air molecules exert an upward force that balances the downward force of gravity.
  • Others argue that air pressure acts equally in all directions, leading to a net force of zero on the body, which prevents crushing.
  • One participant mentions that thermal energy causes gas particles to move randomly, which contributes to the behavior of air and prevents it from collapsing under gravity.
  • There is a discussion about the buoyant force acting on objects like balloons, with some participants noting that balloons filled with lighter gases like hydrogen rise due to being less dense than air.
  • Some participants express skepticism about the "cushioning" concept and question its utility in explaining the phenomenon.
  • One participant highlights that while atmospheric pressure is significant, the random thermal motion of air molecules plays a crucial role in preventing crushing.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the explanations provided. There are competing views regarding the role of thermal energy, the effectiveness of the cushioning concept, and the interpretation of forces acting on the body due to atmospheric pressure.

Contextual Notes

Some discussions involve assumptions about the behavior of gases and the effects of gravity, with references to statistical mechanics and the nature of pressure. The complexity of these interactions is acknowledged but not resolved.

Who May Find This Useful

This discussion may be of interest to students studying physics, particularly those exploring concepts related to fluid dynamics, gas behavior, and pressure. It may also benefit individuals curious about the fundamental principles of atmospheric science.

  • #31
er.manya said:
maybe the area covered by the atmosphere distributes the force exerted by it to such an extent that it makes it minimal on us? correct me please if I am wrong...
As stated several times in this (several year old) thread, air pressure is about 14.7 pounds per square inch.
 
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  • #32
as we go underwater our body succumbs to the pressure extended by water plus the atmospheric pressure..maybe we are like solid blocks...a solid block can bear the force of an anvil coming on it up to certain limit but after that limit it breaks or crushes(as in the peanut and the elephant thread).maybe our body is capable enough to withstand the 14.7 pounds per square inch of pressure...
 
  • #33
or maybe the surface of the Earth is like a neutral point where the net pressure of the atmosphere is 0 and as we go below the Earth's surface (underwater) the force vectors start to play again...
 
  • #34
There are no maybes here; this is very well understood.

What exactly is confusing you?
 

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