Gas Laws Plus Relevant info Flashcards
Boyles Law
The relationship between air volumes and divers air consumption
If the temperature is kept
constant the volume of a given gas will vary inversely to the absolute pressure.
Formula: P1xV1 =P2xV2
Dalton’s law
Partial pressure of gasses at various depths
The partial pressures added together should equal the absolute pressure.
Formula:
Total pressure=P1+P2+P3
Daltons T formula:
Partial Pressure
Depth abs X decimal % mix
Charles law, Gay Lussac’s law
The relationship between pressure and temperature changes
Formula:
P1 x T2 = P2 x T1 (v constant)
V1 x T2 = V2 x T1 ( p constant)
Henry’s law
The effect of partial pressures on the solubility of gases in liquids, and the corresponding effects on decompression.
At a given temp, the amount of any given gas that will dissolve in a liquid is directly proportional to the partial pressure of that gas
1 litre at 1ATA, 5 litres at 5 ATA
Archimedes principal
An object wholly or partially immersed in a fluid is buoyed up by a force equal to the weight of the liquid displaced by that object.
Surface equivalent of 2% CO2 at 30m?
2% x 4 bar = 8% surface equivalent
Solubility of gas is affected by temperature how?
The lower the temperature, the higher the solubility
Difference between gas tension and the partial pressure of the gas outside the liquid is called?
Pressure gradient
Taking up nitrogen in tissues is called?
Absorption or uptake
Giving up nitrogen from tissues is?
Elimination or off gassing
Supersaturation is?
When gas can no longer be held in solution in the tissues, the cause of decompression sickness
Nitrogen is how many more times soluble in fat than in water?
Nitrogen is 5 times
The lighter, less dense a gas is
The faster it will transfer in and out of solution
General gas law
