What factors affect the combustion-supporting properties of O2? 1. Concentration 2. Partial pressure 3. Humidity
a. 1 only
b. 2 only
c. 1 and 2 only
d. 1, 2, and 3
ANS: C
Oxygen is nonflammable, but it greatly accelerates combustion. Burning speed increases with ei-ther (1) an increase in O2 percentage at a fixed total pressure or (2) an increase in total pressure of O2 at a constant gas concentration. Thus, both O2 concentration and partial pressure influence the rate of burning.
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