hot gas
Warm airborne molecules
Hot gas is informal for empty, boastful talk—words that sound impressive but lack substance: His promises were just hot gas.
The metaphor suggests air that rises and dissipates, leaving nothing behind.
The phrase overlaps with hot air, which is more common in American usage.
- steamHeated water's gaseous form
- blow off steamRelease accumulated stress
- steam engineThermal vapor motor
- vaporGaseous form of liquid
- exhaustUse up entirely
exhaust pipe · fumes · plasma · combustion · furnace · turbine · jet engine · engine · bellows · vent · volcanic vent · plume · hiss · blast · jet · propulsion · thermal · smokestack
- cosmic matterstars, galaxies, dark matter, planets, cosmic dust
- interstellar mattercosmic dust, nebulae, nebula, dense clouds, dark clouds
- Rocket Enginesrocket engine, liquid rocket, rocket motor, solid rocket, chemical rocket
- galaxy clusterssuperclusters
- X-ray AstronomyChandra
- galactic coresupermassive black hole, star cluster, bulge