Question
Sat June 25, 2011 By: Shani Mishra

what is difference between gas & vapour

Expert Reply
Mon June 27, 2011
Gas is one of  states of matter. A gas  mixture contains a variety of pure gases much like the  air. What distinguishes a gas from liquids and solids is the vast separation of the individual gas particles. This separation usually makes a colorless gas invisible to the human observer. The interaction of gas particles in the presence of electric and gravitational fields are considered negligible.
 
Vapour is a substance in the gas phase at a temperature lower than a certain temperature called critical temperature. The vapour can be condensed to a liquid or to a solid by increasing its pressure without reducing the temperature.

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