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gaseous
This term is primarily used in scientific, technical, and academic registers to describe the physical state of matter. It carries a neutral, descriptive tone and is most frequently encountered in chemistry, physics, and meteorology when discussing the properties of substances that lack a fixed shape or volume.
In common usage, it is often contrasted with liquid or solid states. While "gas" is the noun for the substance, "gaseous" is the precise adjective used to describe the nature of a substance or a specific phase of existence, such as in the phrase "gaseous exchange" in biological contexts.