Combustible liquids are those with a flash point higher than how many degrees Fahrenheit?

• A. 60
• B. 70
• C. 90
• D. 100

Answer: (C)

Flash point is the temperature at which a liquid gives off enough vapor to form an ignitable mixture with air. In this classification, liquids that need more heat to reach that ignition point are called combustible, meaning their flash point is above a certain temperature. Here, that dividing line is 90°F. So a liquid with a flash point higher than 90°F won’t ignite at typical room temperatures and is considered combustible. The numbers 60°F and 70°F are below this threshold, which would imply a higher ignition risk at lower temperatures, and 100°F isn’t the dividing line used in this item—the standard threshold for this question is 90°F.