Gas
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A gas is one of the four fundamental states of matter. It can be characterized as a fluid of neutrally-charged atoms that have sufficient thermal (kinetic) energy to prevent intermolecular bonding. A gas has no fixed volume and therefore expands to fill its container.

Common examples of gases are the atmospheric nitrogen and oxygen, which are vital for the survival of most carbon-based lifeforms.

In 2267, while taking readings on Zefram Cochrane's friend, Leonard McCoy described it as "unstable, tenuous, like a collection of gases." ()

Gases 
Anesthizine
Carbon dioxide
Chlorine
Craylon gas
Exhaust gas
Helium
Hydrogen
Laughing gas
Methane
Neon
Nerve gas
Neurozine
Nyocene gas
Trionium
Volcanic gas

See also 
Atmosphere
Gas giant
Gas pain
Inert gas
Non-corporeal species
Hull breach
Respiratory system

External link 
 

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Physics