gas the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container
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Wiktionary
Substantiv
bottled gas -
A gas, which is normally a gas at room temperature, stored as a compressedliquid within a metal, or composite gas cylinder.
