User Portlet User Portlet

Discussions
Addendum: If I input the thickness data in meters instead of cm, I get a correct result. This would seem to indicate the Plot function doesn't allow unit simplification to happen properly. Suggestions?
I'm trying to set up a demo that uses heat of fusion as a parameter, and haven't found it available as a property under symbol ChemicalData. The "Properties" list offers VaporizationHeat, but not heat of fusion. ElementData does offer FusionHeat,...
I'm on version 8. Searching within Mathematica for the function ThermodynamicData fails (see screen grab), but if I click "Try your search on all Wolfram sites" I find it. It looks as if this stuff was added post-version 8. If this is so, can I get...