Oxygen Depletion Calculator

The calculation of percentage of oxygen in the air after the evaporation of a volume of liquefied gas – nitrogen or solid CO2 in a confined space.

• Calculate the volume (Vr m3) of the confined space.
• Calculate the volume of the released gas (Vg) by multiplying the volume of the liquid nitrogen (in liters) or weight of solid carbon dioxide (in Kg) by the expansion ratio of LN (.682) or the inverse density of CO2 (.552 m3/Kg).
• Calculate the volume of available oxygen (Vo m3) as 0.2095*(Vr-Vg).
• Calculate the % oxygen available to breathe as 100*Vo/Vr.