http://www.thechembook.com/wiki/index.php/States_of_Matter
http://www.chemguide.co.uk/physical/phaseeqia/phasediags.html
http://www.chem.purdue.edu/gchelp/atoms/states.html
http://www.harcourtschool.com/activity/states_of_matter/
http://www.visionlearning.com/library/module_viewer.php?mid=120
http://www.cpo.com/weblabs/solig.htm
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