Anesthesia Cylinders | How long will my Cylinder last ? 

Quick Add Ons :
1) N2O cylinder may frost - evaporation of liquid N2O will cause consumption of heat which in turn lowers the temperature of remaining N2O liquid and hence cylinder walls may be cold to touch and water vapour from surrounding may even freeze on cylinder if temperature is too low.
2) DO NOT KEEP O2 CYLINDER UNDER DIRECT SUNLIGHT - Increase in temperature will cause increase in pressure within cylinder ( P1/T1 = P2/T2 )
dangerously high pressure can cause EXPLOSION !