Question

9. What is called the' flash point'?​

Answer 1

Flash point, the lowest temperature at which a liquid (usually a petroleum product) will form a vapour in the air near its surface that will “flash,” or briefly ignite, on exposure to an open flame. ... The flash point is a general indication of the flammability or combustibility of a liquid.

Answer 2

"Flash point" is the minimum temperature at which a liquid gives off vapor within a test vessel in sufficient concentration to form an ignitable mixture with the air near the surface of the liquid. The lower the flash point, the easier it is to ignite a liquid solvent.