Oil - Sarcasm Wiki

Contents

1. Overview
2. Etymology
3. Cultural Impact

Viscous water-insoluble liquid

This article is about the chemical substance. For crude oil, see Petroleum . For other uses, see Oil (disambiguation) .

A bottle of olive oil used in food

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Oil. The very word conjures images of slick, dark depths, of ancient sunlight trapped beneath the earth, or perhaps the shimmering sheen on a perfectly prepared meal. It’s a substance as fundamental as water, yet utterly antithetical to it. An oil, in its most basic chemical definition, is a nonpolar substance, meaning its electrical charge is distributed evenly. This characteristic makes it inherently hydrophobic – it recoils from water, refusing to blend, preferring instead the company of its own kind. Lipophilic, it readily dissolves in other oils, forming a harmonious, albeit greasy, union. Most oils are also flammable, a testament to their energy-rich hydrocarbon structure, and many exhibit surface-active properties, capable of reducing tension at interfaces. The majority are unsaturated lipids , molecules that remain stubbornly liquid even when the ambient temperature drops to what would solidify water or most other common substances.

The term “oil” is a remarkably broad umbrella, encompassing chemical compounds that can be structurally diverse, possess vastly different properties, and serve a dizzying array of purposes. They might originate from the depths of the earth, as petrochemicals , or from the living tissues of animals and plants, as animal fats or vegetable oils . Some are volatile, easily turning to vapor, while others are resolutely non-volatile. [1] Their applications are as varied as their origins: they nourish us as food (consider the ubiquitous olive oil ), power our world as fuel (think heating oil ), heal us in medicinal forms (like mineral oil ), facilitate movement as lubricants (the lifeblood of machinery, such as motor oil ), and form the backbone of countless manufactured goods, from vibrant paints to resilient plastics. Even in the realm of the spiritual, specially prepared oils have held profound significance, acting as purifying agents in ancient rituals and continuing to do so in some religious ceremonies today.

Etymology

The word “oil” itself has a history as rich and layered as the substances it describes. Its first documented appearance in the English language dates back to 1176, arriving via the Old French word oile. This, in turn, traces its lineage to the Latin term oleum, [2] a word that itself was borrowed from the Greek ἔλαιον (elaion), meaning “olive oil, oil.” [3] And the origin of elaion? It stems from ἐλαία (elaia), the Greek word for the olive tree, or more specifically, its fruit. [4] [5] The earliest echoes of this linguistic lineage can be found in the Mycenaean Greek script of Linear B , where the words 𐀁𐀨𐀺 (e-ra-wo) and 𐀁𐁉𐀺 (e-rai-wo) appear, offering a tantalizing glimpse into the ancient understanding of this substance. [6]

Types

Organic oils

Organic oils are a testament to the ingenuity of life itself, produced in an astonishing variety of forms by plants, animals, and countless other organisms through intricate metabolic pathways. Scientifically, the term lipid refers to the fatty acids, steroids , and similar chemical compounds commonly found within these biologically produced oils. However, “oil” itself denotes the broader mixture of substances. These organic oils can contain more than just lipids; they may also harbor proteins , waxes (a class of compounds with oil-like characteristics but solid at typical temperatures), and alkaloids .

Lipids are further categorized by their biological origin, their specific chemical structures, and their limited solubility in water, a defining trait that sets them apart from purely aqueous substances. They are characterized by a high content of carbon and hydrogen atoms, with a comparatively low proportion of oxygen when contrasted with other organic compounds and minerals. This composition renders them largely nonpolar molecules, though some, like phospholipids and steroids, possess both polar and nonpolar regions. [7]

Mineral oils

• Main article: Mineral oil

Crude oil, or petroleum , and the vast array of products refined from it, collectively known as petrochemicals , represent cornerstones of the modern global economy. The origin of crude oil lies in the ancient, fossilized remains of organic materials , primarily zooplankton and [algae], which, over eons, have been transformed by complex geochemical processes into the liquid fuel we extract today. [8] The designation “mineral oil” is, in a sense, a misnomer. Minerals are not the direct source; rather, it’s the ancient life forms that provide the raw material. Mineral oil is, by its very nature, organic. It is classified as “mineral oil” rather than “organic oil” due to historical reasons: its organic origin is so remote that it was not understood at the time of its discovery, and it is typically found and extracted in proximity to rocks, subterranean traps, and sandy deposits. Furthermore, the term mineral oil is also used to refer to various specific distillates derived from crude oil. Citation needed

Applications

Cooking

• Main article: Cooking oil

Edible oils, whether derived from plants or animals, along with animal fats , are indispensable in kitchens worldwide for a multitude of cooking and food preparation techniques. Notably, many foods are cooked by frying in oil, which can reach temperatures far exceeding that of boiling water, facilitating rapid and efficient cooking. Oils also play a crucial role in enhancing flavor and altering the textural qualities of food, as exemplified in dishes like stir fry . The sources of cooking oils are diverse, ranging from animal fats such as butter and lard to a wide array of plant-based oils like olive oil , maize , and sunflower oil , extracted from numerous plant species. [9]

Cosmetics

Oils are frequently applied to hair, bestowing a lustrous appearance, preventing tangles and roughness, and helping to stabilize the hair structure, thereby promoting healthy growth. For a more detailed exploration, see hair conditioner . Citation needed

Religion

Throughout history, oil has held a significant place as a medium in religious practices. It is often revered as a spiritually purifying agent and is employed in rituals of anointing . A prime example is holy anointing oil , which has served as a vital ritualistic substance in both Judaism [10] and [Christianity]. [11]

Health

The consumption of oils dates back to antiquity. Rich in fats, oils can also offer beneficial health properties. Olive oil serves as an excellent illustration of this. Its high fat content historically made it useful for illumination in ancient Greece and Rome, providing light for daily activities. It was also used to add substance to food, thereby increasing caloric intake and providing sustained energy. Beyond its nutritional and lighting applications, olive oil functioned as a primitive cleanser. By retaining moisture in the skin while drawing impurities to the surface, it acted as a rudimentary form of soap. When applied to the skin and then scrubbed off with a tool, it would remove grime, leaving a protective layer that could then be more easily washed away with water, thanks to oil’s hydrophobic nature. [12] Fish oils, renowned for their content of omega-3 fatty acids, are recognized for their anti-inflammatory properties and their potential to reduce fat levels in the bloodstream. Citation needed

Painting

• Main article: Oil painting

The ability of oil to effectively suspend pigments makes it an ideal medium for paints . The oldest known surviving oil paintings originate from 650 AD, a testament to the enduring nature of this artistic technique. [13]

Heat transfer

• See also: Transformer oil

Oils are employed as coolants in systems such as oil cooling , notably in electric transformers . Heat transfer oils serve dual roles: as coolants (as seen in oil cooling ) and as heating mediums (e.g., in oil heaters ), facilitating heat transfer in various applications. Citation needed

Lubrication

Synthetic motor oil

The nonpolar nature of oils means they do not readily adhere to other surfaces, making them exceptionally useful as lubricants in a wide range of engineering applications. While biological oils have their uses, mineral oils are more commonly selected for machine lubrication. Whale oil , prized for its low evaporation rate and resistance to leaving residue, was historically favored for lubricating intricate clock mechanisms. However, its use was eventually banned in the United States in 1980. [14]

A persistent myth suggests that spermaceti , derived from whales, has been utilized in high-profile NASA projects like the Hubble Space Telescope and the Voyager probes due to its remarkably low freezing point. This claim is unsubstantiated; spermaceti is not a true oil but a complex mixture of wax esters, and there is no evidence to support NASA’s use of whale oil in these missions. [15]

Fuel

• Main article: Fuel oil

Certain oils, when combusted in liquid or aerosol form, release energy in the form of light and heat . This energy can be utilized directly or transformed into other energy forms, such as electricity or mechanical work. The journey to many fuel oils begins with crude oil , extracted from the earth and transported via oil tanker or pipeline to an oil refinery . Here, it undergoes processing to yield a variety of products, including diesel fuel (petrodiesel), ethane and other short-chain alkanes , fuel oils (the heaviest commercial fuels, used in ships and furnaces), gasoline (petrol), jet fuel , kerosene , historically benzene , and liquefied petroleum gas . A standard 42-US-gallon (approximately 35 imperial gallons or 160 liters) barrel of crude oil yields roughly 10 US gallons (about 8.3 imperial gallons or 38 liters) of diesel, 4 US gallons (about 3.3 imperial gallons or 15 liters) of jet fuel, 19 US gallons (about 16 imperial gallons or 72 liters) of gasoline, 7 US gallons (about 5.8 imperial gallons or 26 liters) of miscellaneous products, 3 US gallons (about 2.5 imperial gallons or 11 liters) split between heavy fuel oil and liquefied petroleum gases, [16] and 2 US gallons (about 1.7 imperial gallons or 7.6 liters) of heating oil. The total output from refining a barrel of crude into various products actually increases to approximately 45 US gallons (about 37 imperial gallons or 170 liters). [16]

During the 18th and 19th centuries, whale oil was a prevalent fuel for lamps, a role later supplanted by natural gas and subsequently by electricity. [17]

Chemical feedstock

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Crude oil can be meticulously refined through fractional distillation into a wide spectrum of constituent hydrocarbons . Petrochemicals are essentially the refined components of crude oil [18] and the myriad chemical products manufactured from them. These find application in the production of detergents , fertilizers , medicines , paints , plastics , synthetic fibers , and synthetic rubber .

Organic oils also serve as a crucial chemical feedstock, particularly within the burgeoning field of green chemistry .