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Atmospheric pressure. What causes atmospheric pressure?. The atmosphere is made up of a mixture of gases It is like a deep sea of air which surrounds the Earth The moving particles in air exert pressure in all directions. Does the atmosphere change?.

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Presentation Transcript
what causes atmospheric pressure
What causes atmospheric pressure?
  • The atmosphere is made up of a mixture of gases
  • It is like a deep sea of air which surrounds the Earth
  • The moving particles in air exert pressure in all directions
does the atmosphere change
Does the atmosphere change?
  • The atmosphere is a gas which can be squashed.
  • The air closest to the Earth is more squashed and so is more dense
  • At higher levels the air becomes less dense, and therefore the pressure it exerts is also reduced
living at different altitudes
Living at different altitudes
  • This leads to increased lung capacity
  • Down at sea level atmospheric pressure is about 100 000 Pa (pressure is sometimes measured in Atmospheres or mmHg)
  • As you increase in altitude the air becomes less dense and the atmospheric pressure decreases
the effects of high altitude on breathing
The effects of high altitude on breathing
  • Athletes train at high altitudes because of the effects on their lungs
  • At lower pressures gas exchange in the lungs is not as easy as at high pressure.
  • There is less oxygen so they have to breath in a greater volume of air
  • Another effect is that the red blood cell count increases in order to transport the oxygen more efficiently through the body
question
Question
  • If atmospheric pressure is 100 000 N/m2, what force is exerted on a wall with an area of 10m2?
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