calculating weight

[Kelly]

I know that 10 gallons is roughly ten pounds but how does that change when
you add rock? The displacement of the water can't be the same weight cause
the rock is heavier right? Does anyone know the formula?

[Dan Norgard]

10 gallons is more like 80lb,
Dan
"Kelly" > wrote in message
news:a1a0c.640378$X%5.411001@pd7tw2no...
I know that 10 gallons is roughly ten pounds but how does that change when
you add rock? The displacement of the water can't be the same weight cause
the rock is heavier right? Does anyone know the formula?

[Kelly]

oops I meant to say 10 pounds per gallon not 10 gallons
"Dan Norgard" > wrote in message
...
> 10 gallons is more like 80lb,
> Dan
> "Kelly" > wrote in message
> news:a1a0c.640378$X%5.411001@pd7tw2no...
> I know that 10 gallons is roughly ten pounds but how does that change when
> you add rock? The displacement of the water can't be the same weight cause
> the rock is heavier right? Does anyone know the formula?
>
>
>

[Ross Bagley]

"Kelly" > writes:

> I know that 10 gallons is roughly ten pounds but how does that change when
> you add rock?

Water (fresh or salt) is basically 8lbs/gallon. On average, with
rock, sand, and living things displacing some of that, the density of
most aquariums will change (as you expected) and end up pretty close
to 10lbs/gallon.

Regards,
Ross

-- Ross Bagley http://rossbagley.com/rba
"Security is mostly a superstition. It does not exist in nature...
Life is either a daring adventure or nothing." -- Helen Keller

[Kelly]

Thanks
"Ross Bagley" > wrote in message
...
> "Kelly" > writes:
>
> > I know that 10 gallons is roughly ten pounds but how does that change
when
> > you add rock?
>
> Water (fresh or salt) is basically 8lbs/gallon. On average, with
> rock, sand, and living things displacing some of that, the density of
> most aquariums will change (as you expected) and end up pretty close
> to 10lbs/gallon.
>
> Regards,
> Ross
>
> -- Ross Bagley http://rossbagley.com/rba
> "Security is mostly a superstition. It does not exist in nature...
> Life is either a daring adventure or nothing." -- Helen Keller

[Steve Sells]

1 gal salt water = 8.5 pounds.

Steve

[Richard Ryerson]

GARF has a "decent" calculator to determine water volume considering
dimensions, live sand and live rock.

http://www.garf.org/calculators/TankVolumeCalculator.asp

-Rick

-
"Kelly" > wrote in message
news:JSe0c.641916$X%5.514934@pd7tw2no...
> Thanks
> "Ross Bagley" > wrote in message
> ...
> > "Kelly" > writes:
> >
> > > I know that 10 gallons is roughly ten pounds but how does that change
> when
> > > you add rock?
> >
> > Water (fresh or salt) is basically 8lbs/gallon. On average, with
> > rock, sand, and living things displacing some of that, the density of
> > most aquariums will change (as you expected) and end up pretty close
> > to 10lbs/gallon.
> >
> > Regards,
> > Ross
> >
> > -- Ross Bagley http://rossbagley.com/rba
> > "Security is mostly a superstition. It does not exist in nature...
> > Life is either a daring adventure or nothing." -- Helen Keller
>
>