Petroleum fractions are the useful substances that make up petroleum. Petrolium itself is not very useful, but the fuels, raw materials, and oil that are part of it are used all the time.
Every fraction is an equivalent fraction: each fraction in decimal form has an equivalent rational fraction as well as an equivalent percentage fraction.
A fraction that has a different sign to the first fraction.
Or both. That's a complex fraction.
Divide the fraction by 100, and you will get the percentage of a fraction.
An improper fraction is a fraction. It can't become a proper fraction.
petroleum gas. this gas is used for cooking.
Asphalt
Petroleum is refined from crude oil and is but one fraction only
It depends on the petroleum. Petroleum is a mixture that varies from one area to another.
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Cracking of petroleum is a chemical process.
Energy, in the form of heat, must.
The fraction of crude oil that has the lowest boiling point is the Liquified Petroleum Gas, which is a mixture of small hydrocarbons(methane, ethane, etc).
Exemples: white spirit, kerosene, diesel fuel, etc.
Feedstock is the stuff you start with... probably crude oil for petroleum chemistry, though you might begin with a particular fraction of the oil instead of crude.
Road tar is made from coal. Asphalt is a heavy fraction of petroleum.