If you are using plastic cups, you can use a permanent marker to label them. Arrange the five cups on a surface, going in a line from left to right.Why do you think it's important to start out with a solution that has such a high concentration of salt? It may take several (five to 10) minutes of stirring, so you may need to be patient. The salt should be completely dissolved before you go on to the next step. Add one more cup of water to the large container (making two and one half cups total) and stir to dissolve the remaining salt.Add one half cup of salt to the large container and stir to dissolve some of the salt (it will not all dissolve yet).Pour one and one half cups of water into your large container.Be sure to always wash your hands after handling uncooked eggs because they may carry salmonella. Take the egg out of the refrigerator and allow it to warm to room temperature.Three spoons for mixing salty solutions.Permanent marker (if you are using plastic cups) or masking tape and a pen (to label nondisposable cups).Five cups that hold at least 16 ounces each.Large container, such as a large bowl or cooking pot (It must be able to hold at least three cups.).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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