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-   -   Pre Boil vs. OG (http://www.homebrewtalk.com/f14/pre-boil-vs-og-361134/)

Toy4Rick 10-15-2012 02:06 AM

Pre Boil vs. OG
Hey gang,

Is there a direct corelation between Pre boil gravity and OG? Meaning, a 1 hour boil in same equipment, similiar boil rate... will produce "x" increase in gravity?

I seem to float between .05 and .09 over the past 6 brews. Today seemed to be of the lowest and I am not sure why

Thanks in advance

pcollins 10-15-2012 02:12 AM

Usually, yes.

Atmospheric pressure, humidity, temperature, etc., all have a bearing on your boil off rate. As you brew more you'll figure out your average but there will be lows and highs. It's not fixed.

Xpertskir 10-15-2012 12:35 PM

Yes but it's not linear in fact I think it's parabolic.

Gravity is the measure of the density of sugar in water so

A pre boil gravity of 1.040 is not going to increase as much over the same boil off rate as a 1.050 pre boil gravity.

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