Try: http://www.refdesk.com .
They have a good section on chemistry.

Gail Shaw wrote:
> 
> Does anyone know, or know where I can find info
> on the physical and optical properties of ethane
> (C2H6) at -178 degrees C and 1.6 atm? It's a liquid
> at that temp and pressure.
> 
> I need the colour, transparency, reflectivity and ior.
> I looked in the newior.inc file, but couldn't find anything.
> 
> Thanks
> 
> Gail

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