gases
n. C / U B1 Intermediate US //ˈɡæsəz// UK //ɡˈæsɪz// gas·es
n. substances like air that are not solid or liquid. They can expand to fill any container they are in.
n. substances in a physical state characterized by low density and the ability to expand indefinitely to fill any available volume. Plural form of 'gas'.
Oxygen and nitrogen are common gases in our atmosphere.
The factory must monitor the release of harmful gases to protect the local environment.
Under high pressure and low temperatures, certain gases can be forced into a liquid state, a process essential for the industrial transport of natural resources.
Usage
Uncountable when referring to the state of matter; countable when referring to specific types or chemical varieties.