Recent content by G-Wheeler

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  1. G

    reading a hydrometer and hydrometer vs. refractometer

    Hydrometers that are read from the top of the meniscus are usually for specialist fluids of known and constant surface tension, such as milk; fluids in which you cannot reliably see the baseline through the fluid. Okay, I suppose, as long as the surface tension of the fluids are comparable.
  2. G

    Hydrometer corrections: a black art?

    Yes, one might as well use an accurate formula as a less accurate one. However, one has to be a bit careful here. Some of these tables give density measured in a vacuum, which is not how we use a hydrometer, of course. I know that it caught me out for while. I couldn't understand why there were...
  3. G

    Hydrometer corrections: a black art?

    Dave Line messed up his temperature correction table in his "Big Book Of Brewing". If you are going to implement a polynomial, you might as well use a polynomial that gives the density of water at different temperatures and then calculate the correction directly. This gives total flexibility...
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