Which of the following medical gases can be maintained in the liquid form at room temperature? 1. Nitrous oxide 2. Carbon dioxide 3. O2 4. Helium
a. 1 and 2 only
b. 2, 3, and 4 only
c. 2 and 3 only
d. 2 and 4 only
ANS: A
Both CO2 and N2O have critical temperatures above normal room temperature (Table 6-5).
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