Definition

1. Adjective:
   • Existing in the state of a gas: Describes matter that is not solid or liquid, but has no fixed shape or volume and expands to fill its container.
   • Having the characteristics of a gas: Possessing the physical properties typical of gases, such as low density and high compressibility.
   • Vague or insubstantial: (Figurative, less common) Describing something that is lacking substance, definite form, or clarity.

Usage Examples

• Describing physical state:
  • Water becomes gaseous when it boils and turns into steam.
  • The planets Jupiter and Saturn are primarily composed of gaseous elements.
• Describing properties:
  • Helium has a very low gaseous density.
  • The chemist analyzed the gaseous mixture from the reaction.
• Figurative use:
  • His promises were gaseous and never materialized into concrete action.
  • The report was filled with gaseous theories but lacked hard data.

Advanced Usage

• "gaseous diffusion": A method used to separate isotopes, especially in the enrichment of uranium, based on the different rates at which gases pass through a barrier.
  • The nuclear facility used the process of gaseous diffusion.
• "gaseous nebula": (Astronomy) A cloud of interstellar gas and dust.
  • The Orion Nebula is a famous example of a gaseous nebula.

Variants and Related Words

• Gas (n): The state of matter itself; a substance in this state.
  • Oxygen is a gas at room temperature.
• Gasify (v): To convert into a gas.
  • The plant will gasify coal to produce synthetic fuel.
• Gaseousness (n): The state or quality of being gaseous.
  • The gaseousness of the atmosphere allows sound waves to travel.

Synonyms

• Vaporous: Relating to or resembling vapor.
• Aeriform: Having the form or nature of air; gaseous.
• Ethereal: Extremely delicate and light, seeming too perfect for this world; (in science) a dated term for a volatile substance.

Antonyms

• Solid: Firm and stable in shape; not liquid or fluid.
• Liquid: Having a consistency like that of water or oil, flowing freely but of constant volume.

Related Phrases/Compounds

• Gaseous exchange: (Biology) The process by which gases (like oxygen and carbon dioxide) are transferred in organisms, e.g., in lungs or leaves.
  • Gaseous exchange in the alveoli is vital for respiration.
• Gaseous phase: (Chemistry) Referring to the state of a substance when it is a gas.
  • In the gaseous phase, molecules are far apart and move rapidly.

Adjective

1. existing as or having characteristics of a gas
   • steam is water is the gaseous state