Fact or Fiction Quiz

Significance & Variations of Atmospheric Pressure

Pressure = cumulative mass of atmosphere Pressure varies - use barometer to measure changes Standard sea level pressure 29.92 " [76 cm or 760 mm] 1013.2 millibars

Vertical Pressure

• altitude decreases pressure
  • Mt. Everest 1/3 pressure
  • water boils at lower temperature — fewer air molecules
  • gravitational pull increases density at lower elevations