- 2C & 1inch pressure decrease per 1000 feet of altitude gained
- sea level:
- 14.7 pounds per square inch (force)
- 29.92 inches Hg (decrease pressure indicate thinning air)
- Air pressure density decreases with altitude
- Airplanes have less air at higher altitudes (less oxygen)
- Air density affects
- 1) Wing: fewer molecule move over the wing produce less lift)
- 2) Propellers: less thrust pulls fewer molecule
- 3) Engine: reduce power because it breathes in thinner air
- An airplane taking off at sea has more air to work with than an other one from at higher altitudes
- Longer ground roll and sluggish climb from the airplane at higher altitudes
- Less Dense Air = Decreased Performance
- Variations in altimeter settings (air density) at different locations are caused by unequal heating of the earth surface
- Warm air expands, becoming less dense
