Thanks, after the little tirade above, you've hit it right on the head!

Rob L

"Jeff French" > wrote in message
om...
> You just completely ignored the previous poster's response...it
> was completely correct that specific gravity is a measure of
> DENSITY and density is NOT affected by gravity.
>
> Density is defined a mass/volume
>
> Weight is mass*gravity (f=ma, anyone?)
>
> In your example the apparent gravity, g_a,
> is equal to the gravity due to the earth, g_e,
> minus the moon gravity due to the moon, g_m
>
> g_a = g_e - g_m
>
> The weight of the wine is g_a * mass(wine),
> so yes, the weight of the wine changes (so
> does the weight of the hydrometer). But buoyancy
> does not depend on weight...the volume of both the
> wine and the hydrometer AND the mass of both the
> wine and hydrometer remain constant.
>
> Thus no effect...end of physics lesson today.
>
> IFbrewer
>
>
>
>
>
>
>
> (OzWineKitz) wrote in message
. com>...
> > Just for the record, the oceans of the world cover approx 75%, the ice
> > at the poles cover approx 3%, and the land masses cover the other 21%.
> > The moon pulls on ALL things realiveto their weight in accordance with
> > basic physice which determines that the Force is proportional to the
> > weight and the distance squared. This is why the moon also contributes
> > to tectonic plate movement and earthquakes, because even the earth is
> > being pulled by the moon. But the weight of a Hydrometer is far less
> > than the weight of of the wine we are measuring. Therefore the
> > difference is exaggerated some 100+ times, isn't it?
> >
> > The question remains,what is the difference? What difference does
> > atmospheric pressure impart to ones readings? Does alcohol behave
> > differently at lower SG than say wine? Does anyone know the actual
> > difference and percentages?
> >
> > Thanks for your imput anyway.
> >
> > Cheers,
> > Steve!