From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


The plaster undergoes a hyration type chemical reaction and that interlinks
the powder of the plaster into a sturdy stone.  Depending upon the amount
of water that you mix in, the plaster may take up most of it in the
hydration and thus the finished dry tool will weigh more than the original
plaster but less than the plaster and water total weight. There's a
chemical reaction listed somewhere that can tell you more about how much
the plaster weight is actually increased and I don't think that the actual
water pickup to complete the reaction is a variable. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

--- BBBS/NT v4.01 Flag-5