You can never say that any particular element or compound IS a gas. Every substance
can be solid, liquid, or gas, depending on the temperature and pressure.
The following substances, along with many others, are gas at room temperature
and pressure ... conditions in which human people are comfortable:
Oxygen
Argon
Nitrogen
Acetylene
Hydrogen
Helium
Carbon-dioxide
Hydrogen-sulfide
Carbon-monoxide
Propane
Butane
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Line,point
2, 3 and 5