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Liquid vs. Oil — What's the Difference?

By Urooj Arif & Fiza Rafique — Updated on May 21, 2024
Liquid is a state of matter with a definite volume but no fixed shape, adapting to its container. Oil is a type of liquid, typically viscous, and derived from various organic sources.
Liquid vs. Oil — What's the Difference?

Difference Between Liquid and Oil

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Key Differences

Liquid is one of the fundamental states of matter, characterized by having a definite volume but no specific shape. It can flow and conform to the shape of its container. Examples of liquids include water, alcohol, and mercury. Oil, on the other hand, is a specific type of liquid that is usually thick and viscous. It can be derived from various sources, such as plants (vegetable oil), animals (fish oil), or minerals (crude oil). Oils are commonly used for lubrication, cooking, and fuel.
In terms of usage, liquids encompass a broad category, including all fluids that can flow, whereas oils are a subset of liquids with specific properties like hydrophobicity and viscosity. For example, water is a liquid but not an oil.
When considering physical properties, liquids can vary widely in viscosity and density. Oil, however, generally has higher viscosity and is less dense than water. This makes oil float on water, demonstrating a key difference in their physical interactions.
Both terms are used in scientific and everyday contexts. Liquid describes a general state of matter, while oil specifies a substance with distinct uses and characteristics. For instance, in the kitchen, you might use oil for frying, but refer to water or broth simply as liquids.

Comparison Chart

Definition

A state of matter with definite volume
A viscous, hydrophobic liquid derived from organic sources
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Viscosity

Can vary widely
Generally high

Density

Varies, often more than oil
Less dense than water

Usage

Broad, including drinking and cleaning
Specific, such as cooking, lubrication, and fuel

Examples

Water, alcohol, mercury
Vegetable oil, fish oil, crude oil

Compare with Definitions

Liquid

A state of matter with no fixed shape but a definite volume.
Water is a liquid that fills the shape of its container.

Oil

A viscous liquid derived from organic materials.
Olive oil is used for cooking.

Liquid

A phase of matter between solid and gas.
At room temperature, mercury remains a liquid.

Oil

A type of liquid that is hydrophobic and non-polar.
Oil and water do not mix because oil is hydrophobic.

Liquid

A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, it is one of the four fundamental states of matter (the others being solid, gas, and plasma), and is the only state with a definite volume but no fixed shape.

Oil

A fuel source extracted from underground deposits.
Crude oil is refined into gasoline.

Liquid

The state of matter in which a substance exhibits a characteristic readiness to flow and little or no tendency to disperse, and is amorphous but has a fixed volume and is difficult to compress.

Oil

An oil is any nonpolar chemical substance that is a viscous liquid at ambient temperatures and is both hydrophobic (does not mix with water, literally "water fearing") and lipophilic (mixes with other oils, literally "fat loving"). Oils have a high carbon and hydrogen content and are usually flammable and surface active.

Liquid

Matter or a specific body of matter in this state.

Oil

A viscous liquid derived from petroleum, especially for use as a fuel or lubricant.

Liquid

(Linguistics) A consonant articulated without friction and capable of being prolonged like a vowel, such as English l and r.

Oil

Oil paint
A portrait in oils

Liquid

Of or being a liquid.

Oil

Information or facts
Young had some good oil on the Adelaide races

Liquid

Melted by heating
Liquid wax.

Oil

Lubricate, coat, or impregnate with oil
A lightly oiled baking tray

Liquid

Condensed by cooling
Liquid oxygen.

Oil

Supply with oil as fuel
Attempts should not be made to oil individual tanks too rapidly

Liquid

Flowing readily; fluid
Added milk to make the batter more liquid.

Oil

Any of numerous mineral, vegetable, or synthetic substances or animal or vegetable fats that are generally slippery, combustible, viscous, liquid or liquefiable at room temperatures, soluble in various organic solvents such as ether but not in water, and used in a great variety of products, especially lubricants and fuels.

Liquid

Having a flowing quality without harshness or abrupt breaks
Liquid prose.
The liquid movements of a ballet dancer.

Oil

Petroleum.

Liquid

(Linguistics) Articulated without friction and capable of being prolonged like a vowel.

Oil

A petroleum derivative, such as a machine oil or lubricant.

Liquid

Clear and shining
The liquid brown eyes of a spaniel.

Oil

A protective or cosmetic liquid applied to the skin or hair.

Liquid

Existing as or readily convertible into cash
Liquid assets.

Oil

Oil paint.

Liquid

A substance that is flowing, and keeping no shape, such as water; a substance of which the molecules, while not tending to separate from one another like those of a gas, readily change their relative position, and which therefore retains no definite shape, except that determined by the containing receptacle; an inelastic fluid.
A liquid can freeze to become a solid or evaporate into a gas.

Oil

A painting done in oil paint.

Liquid

(phonetics) Any of a class of consonant sounds that includes l and r.

Oil

To lubricate, supply, cover, or polish with oil.

Liquid

Flowing freely like water; fluid; not solid and not gaseous; composed of particles that move freely among each other on the slightest pressure.
Liquid nitrogen

Oil

Liquid fat.

Liquid

Easily sold or disposed of without losing value.

Oil

Petroleum-based liquid used as fuel or lubricant.

Liquid

Having sufficient trading activity to make buying or selling easy.

Oil

Petroleum

Liquid

Flowing or sounding smoothly or without abrupt transitions or harsh tones.
A liquid melody

Oil

(countable) An oil painting.

Liquid

(phonology) Belonging to a class of consonants comprised of the laterals and the rhotics, which in many languages behave similarly.

Oil

(painting) Oil paint.
I prefer to paint in oil

Liquid

Fluid and transparent.
The liquid air

Oil

(attributive) Containing oil, conveying oil; intended for or capable of containing oil.
Oil barrel; oil pipe

Liquid

Flowing freely like water; fluid; not solid.
Yea, though he go upon the plane and liquid water which will receive no step.

Oil

(transitive) To lubricate with oil.

Liquid

Being in such a state that the component molecules move freely among themselves, but have a definite volume changing only slightly with changes of pressure, and do not tend to separate from each other as the particles of gases and vapors do when the volume of the container is increased; neither solid nor gaseous; as, liquid mercury, in distinction from mercury solidified or in a state of vapor.

Oil

(transitive) To grease with oil for cooking.

Liquid

Flowing or sounding smoothly or without abrupt transitions or harsh tones.

Oil

Any one of a great variety of unctuous combustible substances, more viscous than and not miscible with water; as, olive oil, whale oil, rock oil, etc. They are of animal, vegetable, or mineral origin and of varied composition, and they are variously used for food, for solvents, for anointing, lubrication, illumination, etc. By extension, any substance of an oily consistency; as, oil of vitriol.

Liquid

Pronounced without any jar or harshness; smooth; as, l and r are liquid letters.

Oil

To smear or rub over with oil; to lubricate with oil; to anoint with oil.

Liquid

Fluid and transparent; as, the liquid air.

Oil

A slippery or viscous liquid or liquefiable substance not miscible with water

Liquid

Clear; definite in terms or amount.

Oil

Oil paint used by an artist

Liquid

In cash or readily convertible into cash without loss of principle; - said of assets, such as bank accounts, or short-term bonds tradable on a major stock exchange.

Oil

Any of a group of liquid edible fats that are obtained from plants

Liquid

A substance whose parts change their relative position on the slightest pressure, and therefore retain no definite form; any substance in the state of liquidity; a fluid that is not gaseous and has a definite volume independent, of the container in which it is held. Liquids have a fixed volume at any given pressure, but their shape is determined by the container in which it is contained. Liquids, in contrast to gases, cannot expand indefinitely to fill an expanding container, and are only slightly compressible by application of pressure.

Oil

Cover with oil, as if by rubbing;
Oil the wooden surface

Liquid

A letter which has a smooth, flowing sound, or which flows smoothly after a mute; as, l and r, in bla, bra. M and n also are called liquids.

Oil

Administer an oil or ointment to ; often in a religious ceremony of blessing

Liquid

A substance that is liquid at room temperature and pressure

Oil

A slippery substance used for lubrication.
The mechanic used oil to lubricate the engine.

Liquid

The state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility

Oil

A substance used in various industries for different applications.
Essential oils are used in aromatherapy.

Liquid

A substance in the fluid state of matter having no fixed shape but a fixed volume

Liquid

A frictionless non-nasal continuant (especially `l' and `r')

Liquid

Existing as or having characteristics of a liquid; especially tending to flow;
Water and milk and blood are liquid substances
Ice is water in the solid state

Liquid

Filled or brimming with tears;
Swimming eyes
Watery eyes
Sorrow made the eyes of many grow liquid

Liquid

Clear and bright;
The liquid air of a spring morning
Eyes shining with a liquid luster
Limpid blue eyes

Liquid

Changed from a solid to a liquid state;
Rivers filled to overflowing by melted snow

Liquid

Smooth and flowing in quality; entirely free of harshness;
The liquid song of a robin

Liquid

Yielding; lacking any hint of hardness;
The liquid stillness of the night enveloping him
The liquid brown eyes of a spaniel

Liquid

Smooth and unconstrained in movement;
A long, smooth stride
The fluid motion of a cat
The liquid grace of a ballerina
Liquid prose

Liquid

In cash or easily convertible to cash;
Liquid (or fluid) assets

Liquid

A substance that flows freely but is of constant volume.
The liquid in the cup spilled when it was knocked over.

Liquid

Any substance in the liquid state of matter.
Liquid nitrogen is used in cryogenics.

Liquid

Fluid that adapts to the shape of its container.
The liquid detergent cleans effectively.

Common Curiosities

Why does oil float on water?

Oil is less dense than water, causing it to float.

What is the viscosity of a liquid?

The measure of a liquid's resistance to flow.

What is oil?

A viscous liquid derived from organic materials, used for various purposes.

Can all liquids mix with each other?

No, some liquids, like oil and water, do not mix.

Why is oil used in cooking?

Oil provides lubrication and can withstand high temperatures.

Can oil be considered a liquid?

Yes, oil is a type of liquid.

Can liquids evaporate?

Yes, liquids can evaporate into gases under the right conditions.

What is a liquid?

A state of matter with a definite volume but no fixed shape.

Is water an oil?

No, water is a liquid but not an oil.

Do liquids always flow?

Yes, liquids have the ability to flow and adapt to their containers.

Are all liquids transparent?

No, liquids can be transparent, translucent, or opaque.

Are all oils used for lubrication?

No, oils have various uses, including cooking and as fuel.

What are common examples of liquids?

Water, alcohol, and mercury.

What are common examples of oils?

Vegetable oil, fish oil, and crude oil.

Is oil always derived from plants?

No, oil can also come from animals and minerals.

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Author Spotlight

Written by
Urooj Arif
Urooj is a skilled content writer at Ask Difference, known for her exceptional ability to simplify complex topics into engaging and informative content. With a passion for research and a flair for clear, concise writing, she consistently delivers articles that resonate with our diverse audience.
Co-written by
Fiza Rafique
Fiza Rafique is a skilled content writer at AskDifference.com, where she meticulously refines and enhances written pieces. Drawing from her vast editorial expertise, Fiza ensures clarity, accuracy, and precision in every article. Passionate about language, she continually seeks to elevate the quality of content for readers worldwide.

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