Gas

A gas is one of the four main phases of matter , that subsequently appear as a solid material is subjected to increasingly higher temperatures. Thus, as energy in the form of heat Heat

In physics [i], heat, symbolized by Q, is defined as energy in transit. ... 

 is added, a solid will first melt to become a liquid , which will then boil Boiling

Boiling is the rapid vaporization [i] of a liquid [i], which typically occurs when a liquid ... 

 or evaporate Evaporation

Evaporation is one of the two forms of vaporization.... 

 to become a gas .

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Timeline

1624   Cornelius Drebbel first discovers gases. 1924   Death penalty: The first state execution using gas in the United States takes place in Nevada.

Encyclopedia

A gas is one of the four main phases of matter , that subsequently appear as a solid material is subjected to increasingly higher temperatures. Thus, as energy in the form of heat Heat

In physics [i], heat, symbolized by Q, is defined as energy in transit. ... 

 is added, a solid will first melt to become a liquid , which will then boil Boiling

Boiling is the rapid vaporization [i] of a liquid [i], which typically occurs when a liquid ... 

 or evaporate Evaporation

Evaporation is one of the two forms of vaporization.... 

 to become a gas .

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