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- Thread starter KLN
- Start date

If you have answers, please help by responding to the unanswered posts.

I got 55 pounds of live sand and 90 pounds of life rock and 45 gallons filled my 55 PERFECT !

This actually isn't exactly right because displacement refers to volume and NOT weight but its a good estimate.

That is why I quantified my statement with:

This actually isn't exactly right because displacement refers to volume and NOT weight but its a good estimate

Just found this tidbit: water weighs 8.3452641 pounds per gallon. Saltwater would then weight that times 1.025 or 8.55 pounds per gallon, I reckon.

So if I have 100 pounds of stuff twice the density of water, it would displace 50 pounds of water, or about 5.8 gallons of water. I would have guessed it was more than that, like someone said above

1)Take a graduated container with a known volume of water (a large glass pyrex measuring cup with 2 cups of water would work well)

2)Weigh out a known amount of dry sand, say 8 ounces (1/2 pound).

3)Add that sand to the measuring cup and note the rise in water volume.

4)Your density is then 8 ounces per (the change in the level of the measuring cup)

NOTE: 16 ounces = 1 pound and 16 cups = 1 gallon.

Example: If 8 ounces took up 1 cup (just speculating) then the density of dry sand would be 8 pounds per gallon. so a 50 pound bag of sand would then take up 6.25 gallons of volume. So as soon as someone has the opportunity to apply this to some dry sand you'll have your answer for the sand )

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