Oil is any neutral, nonpolar chemical substance that is a viscous liquid at ambient temperatures, and is immiscible with water but soluble in alcohols or ethers. Oils may be animal, vegetable, or petrochemical in origin, and may be volatile or non-volatile. Oils have a high carbon and hydrogen content and are usually flammable and slippery.

Organic oils
Organic oils are produced in large diversity by plants, animals, and other organisms through natural metabolic processes. Lipid is the scientific term for the fatty acids, steroids and similar chemicals often found in the oils produced by living things, while petroleum refers to an overall mixture of chemicals. Organic oils may also contain chemicals other than lipids, including proteins, waxes and alkaloids.
Lipids can be classified that they are made by an organism, their chemical structure and their limited solubility in water compared to oils. They have a high carbon and hydrogen content and are considerably lacking in oxygen compared to other organic compounds and minerals; they tend to be relatively nonpolar molecules, but may include both polar and nonpolar regions as in the case of phospholipids and steroids.
Mineral oils
Crude oil, or petroleum, and its refined components, collectively termed petrochemicals, are crucial resources in the modern economy. Crude oil originates from ancient fossilized organic materials, such as zooplankton and algae, which geochemical processes convert into oil. The name is a misnomer, in that minerals are not the source of the oil - ancient plants and animals are. However, it is classified as "mineral oil" instead of as "organic oil" because its organic origin is remote, as well as because it is obtained in the vicinity of rocks, underground traps, and sands.
Oils are applied to hair to give it a lustrous look, to prevent roughness and to stabilize the hair to promote growth.
Oils are commonly used in ritual ceremonies. As a particular example, holy anointing oil has been an important ritual liquid for Judaism and Christianity.
Color pigments are easily soluble in oil, making it suitable as a supporting medium for paints. The oldest known extant oil paintings date from 650 AD.
Heat transfer
Oils are used as coolants in oil cooling, for instance in electric transformers. Oils are also used to enhance heating in other applications, such as cooking, especially in frying.
Oils are commonly used as lubricants. Mineral oils are more commonly used as machine lubricants than biological oils are. Whale oil is preferred for lubricating clocks, because it does not evaporate, leaving dust, although its use was banned in 1980.
Some oils burn in liquid or aerosol form, generating light and heat which can be used directly or converted into other forms of energy such as electricity or mechanical work. To obtain many fuel oils, crude oil is pumped from the ground and is shipped via oil tanker to an oil refinery. There, it is converted from crude oil to diesel fuel (petro diesel), ethane (and other short-chain alkanes), fuel oils (heaviest of commercial fuels), gasoline (petrol), jet fuel, kerosene, benzene (historically), and liquefied petroleum gas. Not all oils used as fuels are mineral oils, see biodiesel and vegetable oil fuel.

  A 42 gallon barrel (U.S.) of crude oil produces approximately 10 gallons of diesel, 4 gallons of jet fuel, 19 gallons of gasoline, 7 gallons of other products, 3 gallons split between heavy fuel oil and liquefied petroleum gases, and 2 gallons of heating oil. The total production of a barrel of crude into various products results in an increase to 45 gallons

In the 18th and 19th centuries, whale oil was used for lamps, which was replaced with natural gas and then electricity.

Petrochemicals are the refined components of crude oil and the chemical products made from them. They are used as detergents, fertilizers, medicines, paints, plastics, synthetic fibers, and synthetic rubber.

Organic oils are another important chemical feedstock, especially in green chemistry.

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