Gasoline provides energy to the engine by combustion, or chemical reaction with oxygen derived from the atmosphere. Due to the fact that gasoline is burned in engines in very short cycles, this process must be carried up quickly and evenly throughout the volume of the engine cylinders. This is achieved by mixing fuel with air before injecting it into the cylinders, creating a so-called. fuel-air mixture, the suspension  how to lose weight fast ery small droplets of gasoline in the air. Very significant influence on the combustion process is also the chemical composition of gasoline. Ability to good combustion of gasoline in the conditions prevailing in engines is determined by the octane number.

Gasoline produced by the rectification of crude oil. Its composition is dependent on the initial composition of the oil and the conditions of rectification.

In order to improve the properties of gasoline as a fuel for engines added small amounts (less than 1%) of selected chemical compounds, called agents przeciwstukowymi. From the 30s Twentieth century to the mid-80s usually you add to that effect was compound tetraethyl lead (czteroetylek lead), and created in this way is called etyliną fuel. Its combustion results in emissions to the environment, however, highly toxic and carcinogenic lead oxide. Therefore, in the mid 80s developed new types of gasoline - so called. unleaded gasoline. For those of gasoline is added to a few percent of aromatic hydrocarbons and ethers with aromatic groups. Addition of these compounds effectively improves the octane rating, but these compounds do not burn completely in the engine compartment, and therefore must be "burning" on the platinum catalyst placed in the exhaust system of cars.
Card of 1988 regulating the

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