Formula For Air/o2, No2/o2 Mixtures

sandman1 · Feb 12, 2005

There must be an easier way but........to figure out how much you are giving CURRENTLY you could.....

2 liters o2= 100% *2 (200)

3 liters air= 21%*3 (63)

2 liters nitrous= 0%

total flow is 7 liters total % o2 is 263

263/7 = 37% 02 delivereed

I'm a second semester student in a front loaded program so forgive me for asking....... Will the machine tell you this or not?

.

jewelcutt · Feb 12, 2005

Yeah, that's how I learned it also. It's easier to calculate N2o with O2 because N2O doesn't contain any O2 so ratios are easy to determine. I just thought it out a little bit. In order to have less than 50% O2 your air would have to be at least double liter flow of O2. I have .5L O2 and 2.5L Air giving 34% O2. Anybody know of an easier way?

mwbeah · Feb 12, 2005

Yeah, that's how I learned it also. It's easier to calculate N2o with O2 because N2O doesn't contain any O2 so ratios are easy to determine. I just thought it out a little bit. In order to have less than 50% O2 your air would have to be at least double liter flow of O2. I have .5L O2 and 2.5L Air giving 34% O2. Anybody know of an easier way?

Don't know if this will help but it works for me, break the air into fifths (1/5 is roughly the O2) so 1 liter of O2 and 1 liter of air equals 60% FiO2. Your mix is now 6 parts O2 of 10 parts or 60%.

Mike

mwbeah · Feb 12, 2005

You asked the question with .5 L of O2 and 2.5 air so that gives you 1/3 of the mix is O2 (1/5 of 2.5 is .5, .5 + .5 = 1, 1/3 = 33 % FiO2)

Mike