Question 972 Deck General

The correct answer is D) give off flammable vapors at or below 80°F (27°C). For the purpose of regulating tank vessels, flammable liquids are defined as liquids that give off flammable vapors at or below 80°F (27°C). This is based on the flashpoint of the liquid, which is the lowest temperature at which the liquid gives off enough vapor to form an ignitable mixture with air. Liquids with a flashpoint at or below 80°F (27°C) are considered flammable and subject to stricter regulations for safe handling and storage on tank vessels. The other options are incorrect because they do not accurately define flammable liquids based on the relevant regulations. Option A refers to Reid vapor pressure, which is not the sole criterion for flammability. Options B and C use different temperature thresholds that do not align with the regulatory definition.