A stationary liquid oxygen system contains 80 lb of oxygen when full.A home care patient is using it 8 hours each day,during sleep,at a rate of 3 L/min.At this usage,how many days will the liquid oxygen last?

Question

Quizplus · Accepted Answer

Use the liquid oxygen duration formula as given previously.
A liter of liquid oxygen weighs 2.5 lb,so: 80 lb/2.5 = 32 L.
Gaseous oxygen occupies a volume that is 860 times the volume of liquid oxygen,so: liters of liquid * 860 = liters of gas.
Duration of supply (minutes)= gas supply remaining (in liters)÷ flow (liters/minute).
Once you get the answer in minutes,you divide by 60 to obtain the number of hours.Then divide the number of hours by the usage,which is 8 hr/day; that gives you 19 days.

A Stationary Liquid Oxygen System Contains 80 Lb of Oxygen