Relative density of an object refers to the property which makes the object either sink or float in water. If an object has more density than water, it will sink. If an object has less density than water, it will float. The property of density allows scientist to identify different elements and also allows then to separate mixtures. There are other factors which can effect the density of water.
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heatWhen water is heated, the molecules in that water move around faster and become more spread out. Because of this, the warmer water actually becomes less dense than room temperature water. In class we did a demonstration with two different jars of water. One jar was hot water and colored red and the other was cold water and colored blue. I put warm water on top of the cold water and the colors did not mix due to the warmer water floating on the colder water.
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Adding salt to the water causes the water to become more dense.Objects which were more dense than freshwater now may be less dense than the salt water solution and float instead of sinking. |