But just how much salt is needed to make an egg float? In this science activity you'll figure that out by making solutions with varying concentrations of salt in them. When enough salt is added to the water, the saltwater solution's density becomes higher than the egg's, so the egg will then float! The ability of something, like the egg, to float in water or some other liquid is known as buoyancy. For example, the density of freshwater under standard conditions is approximately one gram per cubic centimeter.īut, if you add enough salt to the water, the egg will actually float back up to the surface! Adding salt to the water increases the density of the solution because the salt increases the mass without changing the volume very much. Density is the mass of a material per unit volume. Why is this? Because the density of the egg is higher than the density of tap water, so it sinks. If you put an egg in a cup of tap water, it will sink to the bottom. In fact, if you add enough salt, you can make the water so dense that an egg will actually float in it! Explore how this works in this science activity. You can make your own dense water by adding salt to tap water. Because salt water is denser than freshwater, some things float more easily in the ocean-or extremely salty bodies of the water, such as the Dead Sea. If an object is less dense than the water around it, it will float. Have you ever wondered why some objects float in water and others sink? It has to do with the density of the objects compared with the density of the water surrounding them.
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