In fact, the intermolecular forces between the molecules in petrol are so weak that the molecules will gain enough heat energy to escape as a gas to form a flammable mixture with air at temperatures as low as -43 °C. This flammable mixture will ignite in the presence of an ignition source.
Why is petrol so flammable?
Petrol is a highly flammable and dangerous liquid which explodes because of the liquid vapour. Any little ignition from a car, smoke or even a mobile phone can trigger an explosion because when petrol spills, it evaporates rapidly and produces a flammable gas. …
What causes fuel to ignite?
Diesel engines ignite their fuel through compression. Temperature of gas molecules rise when the volume decreases because of the ideal gas law (unless the gas is cooled at the same time). Diesel engines rely on this. A piston compresses the air in the cylinder (see figure 1), making it extremely hot.
Does petrol burn with flame?
The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquified Petroleum Gas (LPG) etc.
Does petrol catch fire easily?
Answer: Petrol catches fire more easily because its ignition temperature is lower than kerosene. Petrol catches fire with very small amount of heat. Q. … Answer: The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances.
Can petrol spontaneously combust?
Can Motor Oil or Gasoline Soaked Rags Spontaneously Combust? … As for gasoline-soaked rags, they usually require an ignition source to ignite their vapors. However, spontaneous combustion can occur if gasoline-soaked rags reach their auto-ignition point of 495°F-536°F.
Can gasoline ignite without a spark?
You could heat the gasoline up to a high enough temperature that it could ignite spontaneously: without even a spark.
Can sparks ignite diesel?
The diesel engine does not use a spark plug, instead using the sheer heat of compression to ignite the fuel. Diesel engines compress the air within the combustion chamber by many times the compression rate used within a gasoline engine.
Which is more flammable petrol or kerosene?
Kerosene has a flashpoint range between 37 and 65 °C. It is less flammable than petrol, however it is still classified as a Class 3 Flammable liquid by the Australian Dangerous Goods Code. … Therefore the more flammable vapours that a substance will produce, the more flammable it will be.