Thanks for that. Sorry for being a bit thick but where did the 0.129
come from is it a constant like the 7.36 or is it arrived at some other
> ray=another formulation which is very accurate and ALLOWS for the--
> less dense portion[ethanol] in an average solution of wash is the sum
> of the difference of the o.g.-f.g. i.e. 50 x0.129 =6.45
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