Define 'flammable liquids.'

• A. Liquids that can easily freeze
• B. Liquids with a flash point below 100 degrees Fahrenheit (37.8 degrees Celsius)
• C. Liquids with a high boiling point
• D. Liquids that emit no fumes

Answer: (B)

Flammable liquids are specifically defined as those that have a flash point below 100 degrees Fahrenheit (37.8 degrees Celsius). The flash point is the lowest temperature at which a liquid can vaporize to form an ignitable mixture in air. This characteristic is crucial in determining the combustibility of liquids, as it indicates how easily a liquid can catch fire under certain conditions.

By contrast, other options do not accurately define flammable liquids. For instance, the ability of a liquid to freeze (option A) does not correlate with its flammability, nor does having a high boiling point (option C) since liquids with both high and low boiling points can be flammable depending on their flash points. Finally, option D is misleading because many flammable liquids do emit fumes, and it is the presence of these vapors that commonly poses a fire risk. Thus, option B stands out as the correct definition when considering the criteria for flammability.