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Salt water contains solutes, and is heavier than pure water. This means that the raft, which will displace its own weight in water, will displace less water (and therefore not sink as far). The effect is that saltier water is more buoyant than less salty water.

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Q: Why would a raft float higher in the ocean than in a river?
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What is salinity used in a sentence?

The salinity of the ocean was much higher than I thought it would be.


What floats better wood or cork?

Cork is lighter than most types of wood and would therefore float higher (or better) in the water.


Do aluminum cans float in water?

Aluminum has a density of 2.7g/cc which is higher than that of water (1.0g/cc) and ordinarily would sink; if the can was empty and thus (like a boat) able to displace more weight in water (by virtue of its volume) than its own weight, it could then float. However, if it was filled with water, its overall density considering both the metal and the container's content, would be higher than water, and it would sink.


Should a material have a higher or lower density to float in water?

A material needs a lower density than water to float in water. Ships float in water because their average density is lower than water. The average density includes the steel hull and the air inside the hull.


Can a hockey puck float on water?

No, because a hockey puck has a higher density than water. In some cases, objects with higher density than water can still float on the water, if they are small enough to avoid breaking the surface tension of the water. This is also the case if the object's mass is distributed across a large enough area, so you could float a penny on water if you put it down flat across the water, but it would not float if you dropped it in on its side. You also could not float that penny if you melted it down and made it into a sphere, for example.

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