The flash point of a material is usually expressed in which unit?

The flash point of a material indicates the lowest temperature at which it can form an ignitable mixture in air. This temperature is crucial for understanding fire hazards and ensuring safe handling and storage of flammable substances.

The most commonly used unit for measuring flash point is Celsius. This is because many scientific and safety standards, including those in chemical handling and materials safety data sheets (MSDS), utilize Celsius due to its alignment with the metric system. Using Celsius allows easy integration with other temperature measurements and scientific calculations.

While Fahrenheit is utilized in some regions, particularly in the United States, Celsius remains the preferred unit for most professional and regulatory applications involving flash points. Kelvin and Rankine are alternative temperature scales that are primarily used in scientific contexts but are not standard for expressing flash points in general safety protocols.