Weight of wood and water volume

[np247921]

Hi

If a bare tank holds 1000 litres water and I put in a 25kg piece of driftwood how much will the volume decrease by? Is their an equation to work this out?

Thanks

 

[KiiNGGiiNGER]

No because no drift wood is not a solid piece. No way to calculate that.

 

[cyberhog05]

lower tank water 1". Place driftwood and siphon water out into a container. Measure the volume of water you removed to get back to that mark you made.

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[Yoimbrian]

Wood does not have a consistent density, it depends on type of wood and condition, so you can't just calculate it. The only way would be like the other guy said, manually measure the volume change in the tank as you push it under water.


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[spiff44]

You can use the archimedes principle... sink it into a container of known volume, then save and measure the displaced water.

 

[Drstrangelove]

Wood does not have a consistent density, it depends on type of wood and condition, so you can't just calculate it. The only way would be like the other guy said, manually measure the volume change in the tank as you push it under water.


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+1.

OP wants to know the displacement of the water by the wood, but only knows the weight of the wood. There are formula if you know the average density of the wood , but unless you have that then it's not possible.

Wood density varies from low (balsa) to high (ebony) in a range of 7 to 83 lbs per cubic foot.


OP, if you go online you can find the average density of the wood you have (assuming you can identify the wood.) Best bet is what Spiff said. Fill a known container with water to the top, put the wood in fully submersed, forcing the water to overflow. Remove the wood, then measure how much water is needed to re-fill the container.