Flight Phys Flashcards
TUC 18,000 and below
30 min
TUC 25,000
3-5 min
TUC 30,000
90 s
TUC 35,000
30-60s
TUC 40,000+
<15s
Boyle’s Law
As altitude increases, pressure decreases, and gas in an enclosed space will expand
P1V1 = P2V2
Charles’ Law
The relationship between temp and volume is proportional to constant pressure. As temp goes up, volume expands.
For every 1000’ up…
temp decreases by 2°C
For every 150 m up…
temp decreases by 1°C
Gay-Lussac’s Law
For a given mass and constant volume, the pressure exerted on the sides of the container is proportional to it’s absolute temp.
Dalton’s Law
The total pressure of a gas mix is equal to the sum of all gases in that mix.
Henry’s Law
The amount of gas dissolved in a solution is directly proportional to the pressure above the solution
Fick’s Law
The rate of diffusion of gas across a permeable membrane is determined by:
- The chemical nature of the membrane
- The surface area of the membrane
- The partial pressure gradient of the gas across the membrane
- Thickness of the membrane
Graham’s Law
The rate of diffusion of a gas is inversely proportional to the square root of its molecular weight. If gas thin, diffusion fast. If gas thick, diffusion slow
Barotitis Media
- Discomfort from pressure increase in ear
- Ear infections, fluid in ear, etc. makes this worse
- Have to be able to clear ears to fly
- Occurs on descent
- Middle ear can’t equalize
