-A state of matter that is made up of particles with no defined volume or shape
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The image above shows what happens to gas molecules when released from the container they are being held. The molecules will spread out, move around, and fill empty spaces; staying in no regular order.
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For more information on gases visit: http://chemwiki.ucdavis.edu/Physical_Chemistry/Physical_Properties_of_Matter/Phases_of_Matter/Gases/Kinetic_Theory_of_Gases/Kinetic_Theory_of_Gases