1% = 10 mg/ml

1/100,000 = 10 mcg/ml

1.36 mmHg = 10 cm H2O

1 atm = 760 torr = 14.7 psi (at sea level)

1 M = 22.4 L gas

time constant = capacity/flow

compliance = v/p

tension = Pr/wall thickness

E cylinder ~4.5L

H cylinder ~40L

CO2 and N2O are vapors

(i.e., gas on top of liquid in the tank)

all others are just gas

·   maintenance (4+2+1 rule)

·   replace NPO losses 50% first hour, 25% 2nd/3rd hours

·   fluid loss from open wound(s) 3-15cc/kg/hr

1% = x(gas) + 100(cc O2)/100x(FGF) where x=50 for iso/halo

33 for sevo/enf, 90 for des

FGF = total fresh gas flow