American Chemical Society (ACS) Laboratory Safety Practice Test

The flashpoint of a chemical is a critical safety parameter that indicates the lowest temperature at which the chemical can form an ignitable mixture with air. At this temperature, the vapor produced by the chemical is sufficient to ignite in the presence of an ignition source, such as a flame or spark. Understanding the flashpoint is essential for handling flammable materials safely, as it helps determine appropriate storage conditions and safety measures needed to prevent fires or explosions.

The flashpoint does not provide information about freezing points, safe storage temperatures, or boiling points, which are related to different properties of a chemical. These other temperatures can contribute to safety considerations, but they do not directly influence the potential for a substance to ignite when exposed to air. Recognizing the correct definition of flashpoint helps in assessing risks associated with chemical use and storage.