What is the temperature range for a material to be classified as a liquid?

The correct classification for a material to be identified as a liquid involves understanding both its melting point and boiling point. The chosen answer indicates that for a substance to be classified as a liquid, it must have a melting point equal to or less than 68°F and a boiling point greater than 68°F.

This means that at temperatures below or equal to 68°F, the substance will transition from a solid to a liquid state, and at temperatures above 68°F, it will remain in a liquid state until it reaches its boiling point. This range ensures that the substance is fluid and can flow, which are characteristic properties of liquids.

Understanding how temperature affects the states of matter is crucial, especially in contexts like firefighting, where smoke detectors and other safety devices rely on the specific properties of materials involved in combustion and heat detection. The other options do not correctly define the typical temperature range associated with the fluid nature of a liquid.