Abstract
Anesthetic potency is often expressed by volume percent or partial pressure in the gas phase, concentrations in the aqueous phase, etc. However, these values do not represent the anesthetic activity at the action sites. Because the activity at the action sites is difficult to obtain, Ferguson (Ferguson, J., 1939. Proc. R. Soc. Lond. B 127 387–404) defined the thermodynamic activity, which is the ratio between the anesthetizing partial pressure and the vapor pressure of the pure anesthetic at the same temperature. This paper discusses the effects of temperature and pressure on the thermodynamic activity of anesthetics. It also discusses the limitations of the Meyer–Overton rule.
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