Difference Between Petrol and Diesel

The importance of obtaining and processing petroleum is not only in the production of petroleum products used as engine fuels, lubricants, or heating fuels, but also in chemical oil processing, where different low molecular weight products are produced, such as methane, ethylene, and other similar products, which serve as starting materials for the synthesis of various basic chemicals as well as final products.

Petrol vs Diesel

The main difference between petrol and diesel is that Petrol has a lower boiling point, shorter chain molecules, and exits the fractional distillation column “higher up,” making it much more volatile. It is usually used in cars rather than heavy vehicles or most other engines (except for cheap small household engines such as lawnmowers and lawnmowers). Diesel fuel contains more energy per liter and is fairly stable at room temperature.

Petrol and Diesel

Petrol, commonly known as gasoline, is a clear fuel generated from crude oil that is used in internal combustion engines. Petrol is manufactured by distilling crude oil at a certain temperature.

At room temperature, hydrocarbon chains are liquid, and they are combined to form petrol. Petrol is made up of paraffin, naphthenes, aromatics, and olefins.

Petrol is extracted from crude oil at temperatures ranging from 40°C to 205°C. The volatility rate of gasoline is regulated by mixing it with butane.

Diesel is a type of liquid fuel used in diesel engines. It is usually made from crude oil, but there are alternatives that cannot be obtained by distilling petroleum fuels.

Diesel molecules have a mixture of carbon chains of 8 to 21 carbon atoms. When injected into hot compressed air, a higher cetane number means that the fuel is easier to ignite.

The viscosity of diesel fuel increases as the temperature decreases, so a specific fuel pump is required to pump the fuel.

Comparison Table Between Petrol and Diesel

Parameters of Comparison PetrolDiesel
FormationPetrol is made up of alkanes and cycloalkanes.Diesel is made up of only alkanes.
Boiling Range60-200 degree celcuis 180-360 degree celcuis
Density0.73 g/cm30.84 g/cm3
RatesMore expensiveCheaper
UsageIt is used as a fuel for electric-ignition piston motors. Diesel is a fuel used in diesel engines and central heating systems.

What is Petrol?

Petrol is a combination of liquid hydrocarbons and ASTM distillation. Petrol is used as a motor fuel in road vehicles, namely in internal combustion engines (Otto engines).

In this case, their use requires combining with air, compressing, initially igniting the mixture with electric sparks, using the mechanical energy generated by the explosion, and finally exhausting the exhaust gas. The most basic quality standard of gasoline is the high octane number.

The octane number offers information about the engine’s fuel combustion process, which may occasionally go wrong in terms of both power recovery and engine maintenance. In order for a certain engine to function properly, the combination of fuel and air must be burned correctly, i.e., at a specific time.

The anti-blasting quality of gasoline is measured by the octane number. When determining the ON, the combustion technique used in a laboratory engine is compared to the combustion of mixtures made from n-heptane and isooctane in various amounts.

The gasoline obtained by the atmospheric distillation of petroleum is insufficient, and the amount of fuel produced is not enough to meet the market demand, and it is necessary to produce new expensive gasoline.

What is Diesel?

Stability is an issue with diesel fuel, just as it is with fuel oils. The fundamental problem is that various fuels cannot be blended without causing damage.

When a cyclic catalytic oil (cracking) is mixed with an oil distillate, the fuel is prone to precipitation. The employment of dispersants and rubber-producing inhibitors allows for the production of mixed fuels like this.

Diesel fuel is produced at refineries in a variety of ways, depending on the engine type and operating circumstances. A diesel engine’s combustion engine differs drastically from that of a gasoline engine.

Fuel is spread in the air stream in petrol engines, where an explosive combination is created first by electric current. The fuel is injected into compressed air that has been heated to the ignition temperature of a diesel engine.

There is no need for an electric spark in this situation to generate combustion. When the cylinder compression chamber is full, the fuel must be burnt at a correct, uniform rate.

Otherwise, oil vapor may reach the combustion zone and burn it, resulting in additional explosion centers. With a normal and incorrect elevation of the pressure in the engine compartment, imbalanced overturning and local overheating would ensue.

Main Differences Between Petrol and Diesel

  1. Petrol is made up of alkanes and cycloalkanes, whereas Diesel is made up of only alkanes.
  2. Petrol is fuel for electric-ignition piston motors. Diesel is a type of fuel that is used in diesel engines and central heating systems.
  3. Petrol’s density is 0.73 g/cm3, whereas Diesel’s density is 0.84 g/cm3
  4. Petrol is more expensive, and Diesel is cheaper than Petrol
  5. Petrol is a combination of liquid hydrocarbons that boils between 60 and 200 degrees Celsius, whereas Diesel is a proportion of oil that boils between 180 and 360 degrees Celsius.
Difference Between Petrol and Diesel


Petrol is a hydrocarbon mixture mostly composed of linear and branching paraffin, olefins, and cyclic hydrocarbons, with molecules containing 5 to 10 carbon atoms with boiling temperatures ranging from 60 to 2000 degrees Celsius. It is used as a propellant fuel in IC engines that use an electric spark to ignite the fuel mixture.

Diesel fuel is made up of a complicated combination of refinery products and additives. It’s made up of kerosene fractions and light gas oil fractions heated to between 180 and 3600 degrees Celsius, and it’s mostly made up of hydrocarbons with 14 to 19 carbon atoms (but up to 25).

It is used as a starting fuel for engines in which the fuel mixture is injected into compressed hot air and burns on its own (without the use of electricity).


  1. https://www.ingentaconnect.com/content/lse/jtep/2014/00000048/00000003/art00006
  2. https://www.sciencedirect.com/science/article/pii/S0967070X1630004X
AskAnyDifference HomeClick here
Search for "Ask Any Difference" on Google. Rate this post!
[Total: 0]
One request?

I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️

Notify of
Inline Feedbacks
View all comments