![]() In which cup does the egg first float? If the egg floated in more than one cup, did you notice any difference in how it floated? What does this tell you about the density of the egg?Įxtra: In this science activity you figured out, within a factor of two, how much salt it takes to float an egg. Repeat this process with cups three, two and then one.Use the spoon to take the egg out and place it in cup four.Use a soup spoon to place an egg in cup five.What is the salt concentration in cup four compared to the other cups? Add ¾ cup of the salt solution from cup three to cup four and mix it.What is the salt concentration in cup three compared to cups one and two? Add ¾ cup of the salt solution from cup two to cup three and mix it.What is the salt concentration in cup two compared to cup one? Add ¾ cup of the salty solution you prepared to cup two and mix it.Add ¾ cup of plain tap water to cups two to five.Add ¾ cup of the salty solution you prepared to cup one.But just how much salt is needed to make an egg float? In this science activity, you’ll figure that out by making salt solutions with varying concentrations of salt in them. When enough salt is added to the water, the saltwater solution’s density is higher than the egg’s, and the egg will then float! The ability of something, like the egg, to float in water or some other liquid is known as buoyancy. Adding salt to the water increases the density of the water because the salt increases the mass without changing the volume very much. For example, the density of freshwater under standard conditions is approximately one gram per cubic centimeter. Density is the mass of a material per unit volume. But, if you add enough salt, the egg will float back up to the surface! Why is this? Because the density of the egg is higher than the density of tap water, the egg sinks. If you put an egg in a cup of tap water, it will sink to the bottom. To find a science fair project that is just right for you, browse our library of over 1,200 Science Fair Project Ideas or use the Topic Selection Wizard to get a personalized project recommendation. Good science fair projects have a stronger focus on controlling variables, taking accurate measurements, and analyzing data. This activity is not recommended for use as a science fair project.
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