Unlike a liquid, it has no fixed volume and will expand to fill the space available.1.'gas'In British and American English, the air-like substance that burns easily and that is used for cooking and heating is called gas.
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Compare liquid One of the three basic forms of matter, composed of molecules in constant random motion.
Unlike a solid, a gas has no fixed shape and will take on the shape of the space available.
(General Physics) a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container.
If very high pressure is applied a gas may become liquid or solid, otherwise its density tends towards that of the condensed phase.