What is flash point?

• A. Lowest temperature liquid will produce flammable gases (vapors) that can ignite.
• B. Highest temperature at which liquid remains stable.
• C. Temperature where a solid melts.
• D. Temperature where autoignition occurs.

Answer: (A)

Flash point is the lowest temperature at which a liquid’s vapors can form an ignitable mixture with air and be ignited by an external flame or spark. This threshold matters for safety because it shows how easily a liquid can ignite and guides how we store and handle it. It’s distinct from the melting point (where a solid becomes liquid) and from the autoignition temperature (the temperature at which a substance will ignite without any flame or spark).