>
>Hi Gail.
>
>AFAIK the index of refraction is linked to the density of the
>matter. You have to find the density of ethane at the point you
>specified and then compared it to the densities and iors you know.
>It's an approximation but better then nothing.
>
>Check this:
>
>http://webbook.nist.gov/chemistry/fluid/
>


Nice. Is there a formula relating ior and density of liquid or should
I just guess?

Thanks
Gail
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