What is the definition of a Flammable Liquid?

A flammable liquid is specifically defined as a liquid that has a flash point of not more than 70 degrees Fahrenheit. The flash point refers to the lowest temperature at which the liquid can form an ignitable mixture with air. This definition is critical in contexts such as transportation and storage, where understanding the flammability characteristics of liquids is essential for safety measures and regulatory compliance.

When considering the other options, while a liquid that evaporates quickly may have some relation to its flammability, it doesn't capture the essential definition tied to flash point criteria. Similarly, stating a flash point over 70 degrees Fahrenheit would mean the liquid is not classified as flammable according to standard definitions. Finally, a liquid that does not ignite in open air does not accurately define a flammable liquid, as it might refer to substances that are inherently non-flammable or stable under common conditions. Thus, the definition that aligns with recognized standards and safety classifications is the liquid with a flash point of not more than 70 degrees Fahrenheit.