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gaseous

Describe the form of a substance that's not solid or liquid as gaseous. Gaseous matter will expand to fit an entire container, and it has no volume and no shape.

Use the adjective gaseous to describe anything having to do with a gas, or that shares some characteristics with gases. While you can't usually see gaseous particles, you can often smell them. You might comment on the stinky gaseous exhaust from a passing bus, or refer to the gaseous nature of the space between the stars in the universe.

Definitions of gaseous
  1. adjective
    existing as or having characteristics of a gas
    “steam is water is the gaseous state”
    Synonyms:
    aeriform, airlike
    resembling air or having the form of air
    aerosolised, aerosolized
    in the form of ultramicroscopic solid or liquid particles dispersed or suspended in air or gas
    evaporated
    drawn off in the form of vapor
    gasified, vaporized, vapourised, volatilised, volatilized
    converted into a gas or vapor
    gassy
    resembling gas
    vaporific, vaporish, vaporous, vapourific, vapourish, vapourous
    resembling or characteristic of vapor
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    Antonyms:
    solid
    of definite shape and volume; firm; neither liquid nor gaseous
    liquid
    existing as or having characteristics of a liquid; especially tending to flow
    hard
    resisting weight or pressure
    coagulated, solidified
    changed into a solid mass
    concrete
    formed by the coalescence of particles
    congealed, jelled, jellied
    congealed into jelly; solidified by cooling
    dry
    used of solid substances in contrast with liquid ones
    semisolid
    partly solid; having a rigidity and viscosity intermediate between a solid and a liquid
    solid-state
    consisting of semiconductor materials and components and related devices
    solid-state
    characteristic of or relating to the physical properties of solid materials especially electromagnetic or thermodynamic or structural properties of crystalline solids
    fluid, runny
    characteristic of a fluid; capable of flowing and easily changing shape
    liquefiable, liquifiable
    capable of being liquefied
    liquefied, liquified
    reduced to a liquid state
    semiliquid
    somewhat liquid
    watery
    relating to or resembling or consisting of water
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