Dion described an equation to estimate the cost of anesthetic used during a surgical procedure.

cost of anesthetic in dollars =

= ((anesthetic vaporizer concentration in percent) * (fresh gas flow in liters per minute) * (duration of anesthesia in minutes) * (molecular weight of anesthetic in grams) * (cost in dollars per mL)) / (2,412 * (density in grams per mL))



• An anesthetic concentration of 0.X% is entered as 0.X

• The equation assumes a temperature of 21°C.

• The factor 2412 is related to the molar volume of a gas (it appears to be 100x the molar volume in liters).

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