What is the flash point of fuel oil?

The flash point of fuel oil is defined as the minimum temperature at which the fuel will produce enough vapor to form a flammable mixture with air when exposed to an open flame. This means that at this specific temperature, if the fuel is ignited, it can catch fire due to the vapor that is present.

Understanding the significance of the flash point is crucial for safe handling and storage of fuels. It indicates the potential risk of fire or explosion when the fuel is exposed to heat sources. This makes option B the correct choice as it accurately describes the flash point itself, which is a critical characteristic for evaluating the safety measures needed during operations involving fuel oil.

The other options relate to different characteristics of fuel and combustion processes. While they provide relevant information regarding ignition and combustion, they do not define the flash point’s specific meaning in terms of safety and combustibility.