Rajan Wilcox
Cigarettes have been blamed for causing many fires, and they are often portrayed in movies as a convenient way to ignite a trail of gasoline. However, the question of whether a cigarette can ignite diesel fuel is more complex. Diesel fuel is classified as a flammable liquid, with a flashpoint range between 100 and 180 degrees Fahrenheit (37 to 82 degrees Celsius). Cigarettes burn at a much lower temperature, approximately 800-1100 degrees Fahrenheit, and can get hotter during a long drag. While diesel fuel can catch fire, it requires intense pressure or a sustained flame to ignite. Experiments have shown that cigarettes do not ignite gasoline vapors, and it is unlikely that they would ignite diesel fuel under typical conditions.
| Characteristics | Values |
|---|---|
| Can a cigarette ignite diesel fuel? | No, diesel fuel has a higher flashpoint than the burning temperature of a cigarette. |
| Burning temperature of a cigarette | 800-1100 degrees Fahrenheit |
| Flashpoint of diesel fuel | 126-205 degrees Fahrenheit |
| Flammability of diesel fuel | Diesel fuel is classified as a combustible liquid, not a flammable liquid. |
| Flammability of gasoline | Gasoline is classified as a flammable liquid. |
| Ignition of gasoline by cigarettes in movies | Common device used in movies. |
| Ignition of gasoline by cigarettes in real life | Unlikely, due to the rapid formation of ash on the cigarette and natural convection of petrol vapour away from the lit area. |
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What You'll Learn
Diesel fuel is a combustible liquid
Diesel fuel is denser and contains more energy than gasoline, resulting in slower burning. This makes it less volatile and less flammable than gasoline, which has a flashpoint of −49°F (−45°C). Due to its higher flashpoint, diesel is considered a Class II liquid by the NFPA, making it less likely to ignite at room temperature. However, once the temperature rises above its flashpoint, diesel can produce vapors that may ignite if exposed to a flame or spark.
The higher flashpoint of diesel fuel also means that it requires intense pressure or a sustained flame to ignite, unlike gasoline, which can be ignited by a tossed match. This makes diesel safer to handle and store compared to liquids with lower flashpoints, as spills or leaks are less likely to result in ignition unless heated above their flashpoint.
While cigarettes have been blamed for causing many fires, it is challenging to ignite certain fuels with a cigarette. Repeated experiments with cigarettes and gasoline vapors have failed to produce ignition. The combustion zone of a cigarette is deficient in oxygen and rich in hydrogen and carbon dioxide, allowing only the most reactive substances to be ignited.
Therefore, diesel fuel is a combustible liquid that requires specific conditions, such as high temperatures or sustained flames, to ignite.
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Cigarettes burn at 800-1100°F
Cigarettes burn at temperatures between 800°F and 1100°F (approximately 426°C and 593°C). This temperature range is high enough to cause ignition in diesel fuel, which has a flashpoint of around 140°F (60°C).
The flashpoint of a fuel is the temperature at which it gives off fumes that are flammable, and diesel fuel is classified as a flammable liquid. However, diesel fuel does not ignite in the same way as gasoline. Gasoline engines use spark plugs to ignite the fuel, whereas diesel engines use glow plugs to heat the fuel mixture and provide combustion. This means that diesel fuel can have a higher flashpoint than gasoline.
Despite the high temperatures reached by cigarettes, it is worth noting that repeated attempts to cause explosions by inserting a lit cigarette into an explosive fuel vapour-air mixture have been unsuccessful. This is because the conditions in the combustion zone of a cigarette, which is deficient in oxygen and rich in hydrogen and carbon dioxide, only allow the most reactive of substances to be ignited.
Cigarettes have been blamed for causing many fires, and they can smoulder undetected before bursting into flames. However, it is important to understand the science behind combustion and the specific properties of different fuels to assess the risk of ignition accurately.
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Diesel ignites at 140°F
The flashpoint of diesel, or the temperature at which it ignites, is approximately 140 °F (60 °C). At this temperature, diesel fuel will ignite without the need for a spark. However, it is important to note that diesel fuel is not as flammable as gasoline and requires intense pressure or a sustained flame to ignite. This is because diesel fuel must be atomized and mixed with air in the right proportions before it can ignite.
The combustion zone of a cigarette is deficient in oxygen and rich in hydrogen and carbon dioxide. These conditions allow only the most reactive of substances to be ignited. While cigarettes have been known to cause fires, they have not been successful in igniting diesel fuel or gasoline vapors in experiments.
Diesel fuel is commonly used in heavy-duty vehicles, generators, and ships. Its higher flashpoint compared to gasoline makes it safer to handle and contributes to its popularity for use in these applications.
While diesel fuel can ignite at 140 °F, it is important to note that this is not the only factor that influences its ignition. The fuel must also be mixed with oxygen and reach the right temperature for ignition to occur. These additional factors further emphasize the safety of diesel fuel and its ability to resist ignition under certain conditions.
In summary, diesel fuel has a flashpoint of 140 °F, but it also requires specific conditions, such as atomization, the presence of oxygen, and the right temperature, for successful ignition. The understanding of diesel ignition is crucial for ensuring operational safety and efficiency in various industries that rely on this fuel type.
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Cigarettes have caused many fires
Cigarettes have been blamed for causing many fires, and while they are a probable ignition source for flammable liquids, they are not capable of igniting all substances. Cigarettes have a combustion temperature of around 800–1100°Fahrenheit, and while dragging on a cigarette, the temperature can increase. However, when not being actively smoked, cigarettes burn at a lower temperature, and the rapid formation of ash may prevent ignition.
Cigarettes have been found to ignite substances like hydrogen and carbon disulphide. They have also been known to cause fires by smouldering; this is a slow flameless combustion that can occur in low oxygen environments, and it can progress undetected for up to 40 minutes before bursting into flames. Smouldering can occur in materials like mattresses and sofas, and it is a serious fire risk.
Despite cigarettes being blamed for many fires, they have not been found to ignite diesel fuel or gasoline. Diesel fuel has a flashpoint range of 100–180°Fahrenheit, and it will only ignite when heated above this point. Gasoline, on the other hand, has a lower ignition temperature than cigarettes, but it is the vapours that are flammable rather than the liquid. In both cases, the probability of a cigarette igniting diesel or gasoline is extremely low.
While cigarettes may not be the direct cause of fires involving diesel or gasoline, they can still be a fire risk. Cigarette butts, for example, are more likely to ignite a lighter, which could then lead to a fire or explosion. Additionally, the visual depiction of cigarettes igniting fuel in movies may give a false impression of their ignition capabilities, leading to an underestimation of the risks associated with cigarettes.
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Diesel fuel can ignite with a spark
A cigarette is a probable ignition source for flammable liquids, and has been blamed for causing many fires. However, diesel fuel is harder to ignite than gasoline. While diesel fuel is classified as a flammable liquid, it has a higher flashpoint than gasoline. Gasoline will ignite from a spark, but diesel fuel will not. Gasoline ignites at normal, ambient temperatures, but diesel fuel requires intense pressure or a sustained flame to ignite.
Diesel fuel has a flashpoint range of between 100 and 180 degrees Fahrenheit (37 to 82 degrees Celsius). The flashpoint of diesel is approximately 140 degrees Fahrenheit (60 degrees Celsius). This means that in most ambient temperatures, diesel fuel will not ignite. However, if the temperature of the environment or other heat sources cause the diesel fuel to heat above its flashpoint, it will start giving off diesel fumes that are flammable, and then it will ignite with a spark or flame.
The diesel internal combustion engine differs from the gasoline-powered Otto cycle by using highly compressed hot air to ignite the fuel rather than a spark plug. In a diesel engine, only air is initially introduced into the combustion chamber. The air is then compressed with a compression ratio typically between 15:1 and 23:1. This high compression causes the temperature of the air to rise. At about the top of the compression stroke, fuel is injected directly into the compressed air in the combustion chamber. The vapour is then ignited by the heat from the compressed air in the combustion chamber.
Therefore, while diesel fuel can ignite with a spark, it requires a higher temperature to do so than gasoline.
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Frequently asked questions
No, diesel fuel does not ignite with a cigarette. Diesel fuel is classified as a combustible liquid and requires intense pressure or sustained flame to ignite. It has a higher flashpoint than gasoline and does not ignite at ambient temperatures.
The flashpoint of diesel fuel is approximately 140 degrees Fahrenheit (60 degrees Celsius). It can vary between 100 and 180 degrees Fahrenheit (37 to 82 degrees Celsius) depending on the specific type of diesel fuel.
Cigarettes burn at a lower temperature than diesel fuel, typically between 800 and 1100 degrees Fahrenheit. The combustion zone of a cigarette is deficient in oxygen and high in carbon dioxide, which prevents the ignition of substances with higher flashpoints.
Cigarettes have been known to ignite certain fuels, such as hydrogen and carbon disulphide. However, they have been found to be unable to ignite gasoline (petrol) in numerous experiments, despite being commonly depicted as doing so in movies.
