Gas Blending Math (He and Nitrox)

Please register or login

Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

Benefits of registering include

  • Ability to post and comment on topics and discussions.
  • A Free photo gallery to share your dive photos with the world.
  • You can make this box go away

Joining is quick and easy. Log in or Register now!

Does anyone actually know the formula with the Z-factor included. I know the formula is a PITA but I am writing my own blending program so I want it for that. I have the TDI advanced gas blending and service manual but it only uses the ideal gas law. I should know this from my physical chemistry class, but I forgot and I have to go and find my book. Help me if you can.
Thanks
ADAM
 
Hello,

Yes I have it, give me a few days and i'll post it. There happens to be 5 variables to work with and the main equasion with around 5 sub equasions to solve. I used the table pasted above and doing the lookup method. It's alot easier than doing the math.

Ed
 
The easy way to do this is with liquid gases.

1 cup liquid nitrogen
2 1/2 cups liquid helium
1 1/3 cups liquid oxygen
dry ice to taste
shake well. Serve chilled.

there no worries.

Brandon
 
Hello,

Sorry it's taken so long to reply.

Beattie-Bridgeman equation of state
(Air from - 145 ¡ãC to + 200 ¡ãC)

p * V^2 = R * T * [ v + 0.04611 * (1 + (0.01101/V)) * (1(4.34*10^4)/(*T^3))

p = pressure, atm
v = molecular volume, lit/mol
R = gas constant 0,08205 lit¨Zatm/mol¨ZK
T = temperature, K.


And I prefer mine stirred not shaken.

Ed
 
https://www.shearwater.com/products/peregrine/
http://cavediveflorida.com/Rum_House.htm

Back
Top Bottom