Usually by burning it.
When burning oil, it gives of a lot of energy that we harvest for daily life (ex: Transportation)
Petrol is a fossil fuel made from crude oil and burning fossil fuels produce energy so yes burning petrol does release energy.
Natural gas is less expensive to produce than distilling crude oil for heating. Though, many different products are produced by distilling and refining crude oil, especially in plastics, etc.
Crude oil is crude..
Polymers are not made into crude oil. Crude oil is made into polymers.
cheap to extract wide range of uses as fuel used to make plastics
Crude oil is simply oil that comes from the Earth. We have to refine it, a distillation process, in order to make it efficiently useful for burning. There are several degrees of refinement. At the bottom, are things like #6 oil; in the middle, are things like #2 oil and diesel; and at the top, are things like gasoline.
It is a mixture of hydrocarbons, which can be separated by fractional distillation. Oil is NOT an element.
What other thing you can do with crude oil.
Yup! Crude Oil -> Crude Oil Vapour --> Diesel Oil --> Ethene --> Poly(ethene)
Crude Oil is hydrocarbon and it is mixture of carbon and hydrogen.