Which term describes liquids with a flashpoint below 100 °F that require extra care because they ignite at lower temperatures?

• A. Flammable
• B. Combustible
• C. Hazardous
• D. Nonflammable

Answer: (A)

Flash point defines how easily a liquid can ignite—it's the lowest temperature at which vapors can form an ignitable mixture with air. When that flashpoint is below 100 °F, the liquid is considered flammable, meaning it can ignite at relatively low temperatures and requires extra precautions during storage, handling, and use to prevent ignition sources. This is why liquids with flashpoints under 100 °F are labeled as flammable. They demand careful measures like proper ventilation, grounding and bonding when transferring, keeping ignition sources away, and using appropriate storage and containment. In contrast, combustible liquids have higher flashpoints (at or above 100 °F) and are not as readily ignitable at room temperature. The broader term hazardous is too general, and nonflammable would imply the liquid does not ignite under typical conditions.