In case this is not legally possible: Dr Darsh grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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{{Information |Description=Free expansion of a gas |Source=http://en.wikibooks.org/wiki/Image:Expansionn.jpg |Date=00:11, 24 June 2006 |Author=b:User:Dr Darsh |other_versions= }} {{PD-user-w|Wikibooks|Wikiversity-Thermodynamics|b:User:Dr Darsh}}