The Concentration Effect is Demonstrated in the Top Half of the Graph in Which 70% Nitrous Oxide (N(2)O) Produces a More Rapid Increase in the Alveolar Anesthetic Concentration (F(A))/Inspired Anesthetic Concentration (F(I)) Ratio of N(2)O Than Does Administration of 10% N(2)O

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The second-gas effect is demonstrated in the lower lines in which the F_A/F_I ratio for halothane increases more rapidly when administered with 70% N₂O than with 10% N₂O.

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Figure 17-3