Because the inflammable gas resulting from the heating is more diluted by the sorrounding air (= less concentration) so the resulting mixture needs an higher heating to produce the same concentration needed for the ignition (answer by Linetronic Technologies technichan)
All fuel oils have a flash point of 490F (254C). Distillate fuels have lower flash points.
Closed flash point refers to the minimum temperature at which a flammable liquid gives off sufficient vapor to form an ignitable mixture in the presence of an ignition source, under specific test conditions where the container is closed. It is an important safety parameter for handling and storing flammable liquids.
For a closed shape, they are point inside its boundary or perimeter.
Take the set of points 1/n for all integers n. This is an isolated set of points- that is, for any of them there is an open ball about the point not containing any other point. However, this set has a limit point which is not contained in the set (namely 0), hence it is not closed.
The flash point of diesel is typically around 52-96C, while the flash point of petrol is usually around -45C. The flash point is the temperature at which a substance can ignite when exposed to a flame or spark. A higher flash point, like that of diesel, means it is less flammable and safer to handle compared to petrol, which has a lower flash point and is more flammable. This difference in flash points impacts the safety protocols and precautions needed when handling and storing these fuels.
Smoke point: reaching this temperature the oil support a thermal dissociation (and degradation) process: formation of glycerol and fatty acids, acrolein, etc. A great smoke point is a quality for an edible oil. Flash point: temperature of combustion; the flash point is of course greater than the smoke point.
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Normally Liquids only have flash points......In some cases, flash point also can be determined for solids, its value depends on type of solid.
The flash point is typically measured using a closed-cup or open-cup apparatus according to standard testing methods such as ASTM D93. The test involves heating the sample in a controlled manner while introducing a flame at regular intervals, and the temperature at which ignitable vapors are produced is recorded as the flash point.
It depends on the material and the location of points a and b.
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The flash point of a flammable liquid is the lowest temperature at which the liquid can vaporize to form an ignitable mixture with air. It is a critical property used to assess the fire hazard of the liquid; a lower flash point indicates a higher risk of ignition. Flash points can vary significantly among different substances and are determined through standardized testing methods. Understanding the flash point is essential for safe handling, storage, and transportation of flammable liquids.