noun

a gas that is burned with oxygen to produce a flame that can cut metal

noun

a poisonous gas with a strong unpleasant smell, or the gas dissolved in water. It is used in products used for cleaning things.

noun

a gas that is in the air and that does not produce a chemical reaction when mixed with other substances. It is sometimes used in electric lights.

noun

a type of gas in liquid form that is used as a fuel

a type of gas sold in large metal containers and used as fuel when you are camping or in buildings where there is no gas supply

noun

the gases carbon dioxide and carbon monoxide

noun

a gas without colour or smell, produced when you breathe out or when substances containing carbon are burnt. The fact that the earth is getting hotter because of carbon dioxide in the atmosphere is called the greenhouse effect.

noun

a poisonous gas with no colour or smell, produced by the engines of vehicles

noun

chlorofluorocarbon: a gas used in fridges and in some aerosol containers. CFCs are not often used any more because they damage the ozone layer of the Earth’s atmosphere.

noun

a gas with a strong smell, often used for killing bacteria in water

noun

a cfc

noun

a gas used by the police for controlling crowds of people. It hurts your eyes and makes it difficult for you to breathe.

noun

a gas that has no colour and no smell and burns very easily. It is obtained from petroleum and natural gas and is used as a fuel.

noun

a gas obtained from petroleum and natural gas. It is used in making polythene and other chemicals and to make fruit ripen (=become ready to eat or use).

noun

a chemical element that is a poisonous yellow gas

noun

a gas with no colour and a strong smell, used mixed with water for preserving dead things in a laboratory

noun

smoke or gas that has an unpleasant smell, especially harmful smoke or gas

noun

a substance such as air that is neither a solid nor a liquid

noun

a gas used for harming or killing people, or for affecting their behaviour

noun

a gas that stops heat from escaping from the atmosphere and causes the greenhouse effect. Carbon dioxide is a greenhouse gas.

noun

a gas that is lighter than air, often used for lifting large balloons

noun

a gas that has no colour or smell and is lighter than air

adjective

a hyperbaric gas is at a higher pressure than it normally is

noun

a gas with no colour, used in some types of light

noun

the gas nitrous oxide used in the past by doctors and dentists to prevent people feeling pain during a medical operation

noun

an amount of liquid or gas that comes out of a hole or crack in something

noun

an amount of gas or liquid that leaks from something

noun

a gas that is produced when plants in an area of wet land decay and consists mainly of methane

noun

a gas with no colour or smell that is used as a fuel

noun

a cloud of unpleasant gas or smoke

noun

a poisonous gas that burns your skin, eyes, nose, throat, and lungs, used especially in the First World War

noun

a gas that is found inside the earth and that can be used for heating or cooking

noun

a gas that shines brightly when electricity flows through it, used in lights and signs

noun

using neon

noun

a poisonous gas that damages people’s nerves and can kill them, used as a weapon in war

noun

a gas with no colour or smell that exists in large quantities in the air that we breathe

noun

a very poisonous brown gas often found in smog and exhaust from vehicles

noun

a gas used in the past by doctors and dentists to prevent people feeling pain during a medical operation

noun

a gas that does not react with other substances, from the group of gases that includes helium and neon

noun

a mixture of oxygen and a gas called acetylene, used as a fuel for making a very hot flame that cuts metal

noun

a gas in the air that has no smell or taste, and that all animals depend on to breathe

noun

a kind of oxygen that exists high in the Earth’s atmosphere

noun

a substance similar to a gas that has almost no electric charge

noun

gas used for killing or harming people

noun

a hydrocarbon gas obtained from natural gas or petroleum, used as a fuel for cooking and heating

noun

a gas used for forcing a substance out of a spray can when you push the button on top

noun

a type of radioactive gas that is produced when radium separates into the parts it is made of

noun

a poisonous gas used as a weapon by some terrorists

noun

gas produced from shale, used for heating, cooking, etc

noun

a poisonous gas with a strong smell, used in industry and often a cause of air pollution

noun

a gas that makes your eyes sting, used especially by the police to control violent crowds

noun

a gas with no colour or smell that is used for making lights