Question

What is the fire point of a fuel?
A. high temperature
B. The fire point of a fuel is the lowest temperature at which the vapor of that fuel will continue to burn.
C. low temperature
D. None of these.

Answer 1

Any material that can be made to react with other substances so that it releases chemical or nuclear energy as heat or work is referred to as fuel. Flash point and fire point of a fuel indicates how much hazards the materials have when storing or transporting safely.

Complete step by step solution:
Flash point and fire point of a fuel are similar.
The lowest temperature at which a volatile material can vaporize to form an ignitable mixture in air is called flash point. It requires an ignition source to measure the flash point. At this point, the vapor cease to burn when the source of ignition is removed. The temperature at which the vapor produced by the fuel will continue to burn for at least five seconds after ignition by an open flame. At the flash point, the substance will ignite briefly, but vapor might not be produced at a rate to sustain the fire. Both flash points and fire points of fuel are mostly determined by an apparatus called pensky martens apparatus. Combustibility of a material can be determined using fire point. While the flash point is used to measure the capacity of a material to catch flames and determine the presence of volatile and flammable substances. It also depends upon the sample size and ignition source.

Note: There are different types of factors affecting the fire point of a fuel. Some of them are pressure, oxidant, apparatus sheltering etc. The apparatus must be shielded from sunlight as sunlight causes an increase in the temperature of the fuel before we start the heating. Thus it will not give the exact value because of the rate of increasing temperature.