Ask Difference

Gas vs. Petrol — What's the Difference?

By Tayyaba Rehman — Published on September 6, 2023
Gas is the short form for gasoline in the US, while petrol is the term used in the UK for the same fuel.
Gas vs. Petrol — What's the Difference?

Difference Between Gas and Petrol

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Key Differences

Gas and petrol are terms that refer to the same substance, but are used in different regions. In the United States, people commonly use the term "gas" to refer to the fuel for cars, while in the UK and other Commonwealth countries, the term "petrol" is used.
When Americans talk about gas, they are usually referring to gasoline, a liquid derived from petroleum used to power internal combustion engines. On the other hand, when Britons mention petrol, they are speaking about the exact same fuel.
The word gas can also be a short form for "gasoline" or refer to any substance in a gaseous state, like oxygen or carbon dioxide. In contrast, petrol specifically refers to the liquid fuel for vehicles.
It’s essential for travelers to understand that gas and petrol refer to the same thing when it comes to fuel. When in the US, you'd ask where the nearest gas station is, but in the UK, you'd ask for the nearest petrol station.
Both gas and petrol are derived from crude oil and undergo refining processes. They are crucial components of the modern transport system, whether you're filling up your vehicle with gas in the US or petrol in the UK.
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Comparison Chart

Terminology Origin

US term
UK/Commonwealth term

Other meanings

Can also refer to substances in a gaseous state (e.g., natural gas)
Specifically refers to the liquid fuel for vehicles

Derivation

Short for "gasoline"
From "petroleum"

Usage

Common in North America
Common in UK, Australia, and other Commonwealth countries

Chemical Composition

Hydrocarbon mixture
Hydrocarbon mixture

Compare with Definitions

Gas

A state of matter with no fixed shape.
The helium gas filled the balloon.

Petrol

Liquid fuel for internal combustion engines.
The car runs on petrol.

Gas

Slang term for something very entertaining or funny.
That comedian was a real gas!

Petrol

A term used in the UK and Commonwealth for gasoline.
Petrol prices are rising again.

Gas

(US) To fill (a vehicle's fuel tank) with fuel.

Petrol

Derived from petroleum, a naturally occurring liquid.
Petrol is refined from crude oil.

Gas

A fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely

Petrol

Used in many parts of the world outside North America.
In India, people refer to gasoline as petrol.

Gas

A gaseous anesthetic, such as nitrous oxide.

Petrol

Gasoline.

Gas

Flatulence.

Petrol

(informal) A motor vehicle powered by petrol (as opposed to diesel).

Gas

(Slang) Idle or boastful talk.

Petrol

A volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines

Gas

Poison gas.
The artillery fired gas shells into the enemy trenches.

Petrol

A light fuel oil that is obtained by distilling petroleum and used in internal combustion engines.
Petrol fumes

Gas

(intransitive) To emit gas.
The battery cell was gassing.

Petrol

A shade of greenish or greyish blue.

Gas

(transitive) To singe, as in a gas flame, so as to remove loose fibers.
To gas thread

Petrol

Petroleum, a fluid consisting of a mixture of refined petroleum hydrocarbons, primarily consisting of octane, commonly used as a motor fuel.

Gas

A complex mixture of gases, of which the most important constituents are marsh gas, olefiant gas, and hydrogen, artificially produced by the destructive distillation of gas coal, or sometimes of peat, wood, oil, resin, etc. It gives a brilliant light when burned, and is the common gas used for illuminating purposes.

Petrol

Petroleum.

Gas

Same as gasoline; - a shortened form. Also, the accelerator pedal of a motor vehicle; used in the term " step on the gas".

Petrol

Often the main subject of fuel efficiency discussions.
How many miles per gallon of petrol does your car get?

Gas

A pedal that controls the throttle valve;
He stepped on the gas

Gas

Short for gasoline, a fuel derived from petroleum.
I need to fill my car with gas.

Gas

Gas is one of the four fundamental states of matter (the others being solid, liquid, and plasma).A pure gas may be made up of individual atoms (e.g. a noble gas like neon), elemental molecules made from one type of atom (e.g.

Gas

A substance or matter in a state in which it will expand freely to fill the whole of a container, having no fixed shape (unlike a solid) and no fixed volume (unlike a liquid)
Hot balls of gas that become stars
Poisonous gases

Gas

Short for gasoline
We stopped for gas

Gas

An entertaining or amusing person or situation
The party would be a gas

Gas

Kill or harm by exposure to gas
My son was gassed at Verdun

Gas

Talk excessively about trivial matters
I thought you'd never stop gassing

Gas

Fill the tank of (a motor vehicle) with petrol
After gassing up the car, he went into the restaurant

Gas

Very amusing or entertaining
Ruthie, that's gas—you're a gem

Gas

Any of various mixtures of flammable gases used for lighting, heating, or cooking.

Gas

Gasoline.

Gas

The speed control of a gasoline engine. Used with the
Step on the gas.

Gas

A gaseous asphyxiant, irritant, or poison.

Gas

Flatus.

Gas

(Slang) Someone or something exceptionally exciting or entertaining
The party was a gas.

Gas

To treat chemically with gas.

Gas

To overcome, disable, or kill with poisonous fumes.

Gas

To give off gas.

Gas

(Slang) To talk excessively.

Gas

Matter in an intermediate state between liquid and plasma that can be contained only if it is fully surrounded by a solid (or in a bubble of liquid, or held together by gravitational pull); it can condense into a liquid, or can (rarely) become a solid directly by deposition.
A lot of gas had escaped from the cylinder.

Gas

(uncountable) A flammable gaseous hydrocarbon or hydrocarbon mixture used as a fuel, e.g. for cooking, heating, electricity generation or as a fuel in internal combustion engines in vehicles, especially natural gas.
Gas-fired power stations have largely replaced coal-burning ones.

Gas

A chemical element or compound in such a state.
The atmosphere is made up of a number of different gases.

Gas

(countable) A hob on a gas cooker.
She turned the gas on, put the potatoes on, then lit the oven.

Gas

(uncountable) Methane or other waste gases trapped in one's belly as a result of the digestive process; flatus.
My tummy hurts so bad – I have gas.

Gas

Arterial or venous blood gas.

Gas

Marijuana, typically of high quality.

Gas

, a light derivative of petroleum used as fuel.

Gas

Ellipsis of gas pedal

Gas

(transitive) To attack or kill with poison gas.
The Nazis gassed millions of Jews during the Holocaust.
He never fully recovered after he was gassed on the Western Front.

Gas

To talk in a boastful or vapid way; chatter.

Gas

To impose upon by talking boastfully.

Gas

(transitive) To impregnate with gas.
To gas lime with chlorine in the manufacture of bleaching powder

Gas

(US) To give a vehicle more fuel in order to accelerate it.
The cops are coming. Gas it!

Gas

(slang) comical, zany; fun, amusing.
Mary's new boyfriend is a gas man.
It was gas when the bird flew into the classroom.

Gas

An aëriform fluid; - a term used at first by chemists as synonymous with air, but since restricted to fluids supposed to be permanently elastic, as oxygen, hydrogen, etc., in distinction from vapors, as steam, which become liquid on a reduction of temperature. In present usage, since all of the supposed permanent gases have been liquified by cold and pressure, the term has resumed nearly its original signification, and is applied to any substance in the elastic or aëriform state.

Gas

The accelerator pedal of a motor vehicle; used in the term " step on the gas".

Gas

Same as natural gas.

Gas

An exceptionally enjoyable event; a good time; as, The concert was a gas.

Gas

To singe, as in a gas flame, so as to remove loose fibers; as, to gas thread.

Gas

To impregnate with gas; as, to gas lime with chlorine in the manufacture of bleaching powder.

Gas

To expose to a poisonous or noxious gas

Gas

The state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container

Gas

A volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines

Gas

A state of excessive gas in the alimentary canal

Gas

A fossil fuel in the gaseous state; used for cooking and heating homes

Gas

Show off

Gas

Any substance in gaseous form.
Carbon dioxide is a greenhouse gas.

Gas

A pedal in a car to control acceleration.
Press the gas to go faster.

Gas

The state of matter distinguished from the solid and liquid states by relatively low density and viscosity, relatively great expansion and contraction with changes in pressure and temperature, the ability to diffuse readily, and the spontaneous tendency to become distributed uniformly throughout any container.

Gas

A substance in the gaseous state.

Gas

(slang) A humorous or entertaining event or person.

Gas

(slang) Frothy or boastful talk; chatter.

Gas

(baseball) A fastball.
The closer threw him nothing but gas.

Gas

An internal virtual currency used in Ethereum to pay for certain operations, such as blockchain transactions.
Gas fee

Gas

Attack with gas; subject to gas fumes;
The despot gassed the rebellious tribes

Common Curiosities

Can the word "gas" refer to something other than gasoline?

Yes, "gas" can also refer to any substance in a gaseous state.

Is "gas" used to refer to the fuel in the UK?

No, in the UK, the term used is "petrol."

Do "gas" and "petrol" refer to the same thing?

Yes, they both refer to the liquid fuel used in cars, but the terminology varies by region.

What is the origin of the word "petrol"?

"Petrol" is derived from the word "petroleum."

In which countries is "petrol" the common term for car fuel?

It's common in the UK, Australia, and many other Commonwealth countries.

What is "gas" short for in the US?

In the US, "gas" is short for "gasoline."

Is there a difference in the chemical composition of gas and petrol?

No, they are both hydrocarbon mixtures derived from crude oil.

What's the primary distinction between gas and petrol in everyday language?

The primary distinction is regional usage, with "gas" being American and "petrol" being British.

Are gas stations and petrol stations the same thing?

Yes, they serve the same purpose; the terminology just varies by region.

Why might someone in the US be confused when hearing "petrol"?

Because the common term in the US for the fuel is "gas" or "gasoline."

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Author Spotlight

Written by
Tayyaba Rehman
Tayyaba Rehman is a distinguished writer, currently serving as a primary contributor to askdifference.com. As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.

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