Some objects float in water and other sink. But did you know that you can change whether something floats or sinks by adding a substance to the water? Let's try it and see! Pour water into a cup until ...

Less dense solutions and objects float on top of solutions of greater density ... Avoid pouring oil down the drain of a sink or toilet because oil can clog pipes! Either wash and reuse the bottle or ...

If you could somehow keep increasing the density of the block, it would sink lower and lower into the water. When its density increased enough to displace an amount of water whose weight was equal ...