Charles Law is used to show the relationship between a gas and any pressure and temperature changes. In the Scuba diving world, we use it to show how your air (gas) consumption changes in relation to your depth (pressure) and water temperature.
Charles Law is used for precise dive planning. It's more commonly used during the PADI Divemaster course (to learn the gas-pressure-temperature relationship) and by PADI Instructors while teaching the Divemaster course. Play with the calculator, but basically the deeper you go the more air you will consume. Also, the cooler the water temperature, the denser the air (which means you'll consume a little more air).
Enter the starting depth, volume & temperature. Next, enter the ending depth and temperature. click on the Calculate button. The program will calculate the ending volume for you. Use the "Salt Water/Fresh Water" button to calculate for either salt or fresh water.
Note - The following defaults will be used unless a different value is used:
Starting depth - 0
Starting volume - 1
Starting temperature - 70 F
Ending temperature - 70 F
NOTE - Temperature is in Degrees F, Depth in Feet
To calculate the ending volume by hand use the following formula.P1 X V1 P2 X V2 ____________ = ____________ T1 T2Where:
P1 is the starting depth in feet - Ex: 33
V1 is the starting pressure in psi - Ex: 2250
T1 is the starting temperature in F - Ex: 90
P2 is the ending depth in feet - Ex: 99
V2 is the unknown variable
T2 is the ending temperature in F - Ex: 75