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Ally and Tanya

When you place a block of wood into a container of water, the block removes some of the water, and the water level goes up. If you could weigh the water that the wood removes, you would find that its weight equals the same as the wood.

This doesn't mean that if you had a few blocks of wood that were exactly the same , they would each remove the same amount of water. A block of wood made of oak, sits deeper in the water (which removes more  water) than does a block of pine. The reason is that it's heavier for its size is because the molecules that make it up are more packed together than the molecules that make up the pine.

 

 

If you could somehow keep increasing the weight of the block, it would sink lower and lower into the water. When its weight increased enough to remove an amount of water whose weight is the same weight of the block, it would become weightless in the water.

 

Making the block just weigh slightly less which would cause it to sink to the bottom.