• Atmosphere is caused by pull of gravity
• Atmospheric pressure is caused by weight of air
• Not uniform, but avg is ~1atm
• Ideal Gas Law
  • $$\frac{PV}{T}_{before} = \frac{PV}{T}_{after}$$
  • if temperature is constant then
  • $$[PV]_{before} = [PV]_{after}$$
  • if pressure constant
  • $$[\frac{volume}{temp}]{before} = [\frac{volume}{temp}]{after}$$
    • less temperature == less volume
• Buoyancy of air
  • Seen with baloons
  • displace is heavier than itself
• Bernoulli principle
  • When speed of a fluid increases, the internal pressure decreases
  • ![[Bernoillu.png]]
    • High pressure goes to lower pressure
    • so ping pong ball gets sucked
  • ![[bernoulli plane.png]]
• Plasma
  • Electrified gas
  • Sun is plasma
  • Electrons are free