What is defined as a liquid with a flash point below 100 degrees Fahrenheit?

A liquid is classified as flammable if it has a flash point below 100 degrees Fahrenheit. The flash point is the lowest temperature at which the vapor of the liquid can ignite in air, which signifies that the vapor is capable of burning when exposed to a flame or spark. This ability to ignite easily under normal atmospheric conditions is what makes such liquids particularly hazardous in environments where ignition sources are present.

In contrast, non-flammable liquids have flash points that are at or above 100 degrees Fahrenheit, making them less likely to ignite under typical conditions. Corrosive substances refer to materials that can chemically damage or destroy other substances upon contact, which is not related to their capacity to ignite. Solid substances, while they can also be flammable under certain conditions, are not defined by flash points since flash points pertain strictly to liquids.

Therefore, the defining characteristic of a liquid with a flash point below 100 degrees Fahrenheit is its classification as a flammable liquid, highlighting its potential risk for combustion.