Flammable liquids are defined as liquids that have which of the following properties?

Flammable liquids are defined as liquids that have which of the following properties?

• A. Have a flash point below 100 F and a vapor pressure not exceeding 40 Pisa at 100 F
• B. Have a flash point above 200 F and a vapor pressure above 60 Pisa
• C. Are always aerosols in a can
• D. Have a vapor pressure well above 100 Pisa at any temperature

Answer: (A)

Flammable liquids are identified by how easily they give off ignitable vapors, which is tracked by two things: a low flash point and a certain range of vapor pressure at a reference temperature. A flash point below 100°F means the liquid can form ignitable vapors at relatively low temperatures, so ignition is possible in normal working conditions. The vapor pressure criterion helps separate typical flammable liquids from extremely volatile gases or pressurized aerosols; a vapor pressure not exceeding 40 psi at 100°F indicates sufficient volatility to produce vapors, but not so high as to be treated as a compressed gas scenario. The other options either imply a high flash point (less flammable under standard definitions), claim aerosols, or require vapor pressures that are unrealistically high for this category. So the combination of a flash point below 100°F with a vapor pressure not over 40 psi at 100°F best fits the typical definition.

Flammable liquids are identified by how easily they give off ignitable vapors, which is tracked by two things: a low flash point and a certain range of vapor pressure at a reference temperature. A flash point below 100°F means the liquid can form ignitable vapors at relatively low temperatures, so ignition is possible in normal working conditions. The vapor pressure criterion helps separate typical flammable liquids from extremely volatile gases or pressurized aerosols; a vapor pressure not exceeding 40 psi at 100°F indicates sufficient volatility to produce vapors, but not so high as to be treated as a compressed gas scenario. The other options either imply a high flash point (less flammable under standard definitions), claim aerosols, or require vapor pressures that are unrealistically high for this category. So the combination of a flash point below 100°F with a vapor pressure not over 40 psi at 100°F best fits the typical definition.