March 4, 2010
Egg Buoyancy and Density:
Can you make an egg float by changing the density of water?
If you put an egg in tap water, it will sink to the bottom. If you add enough salt, the egg will float to the surface. Density is the mass or volume of an object. It’s easier to think of it as the thickness of the object. Buoyancy is the force that allows an object to float. I performed a fun experiment to see how increasing density of water could make an egg float or submerge. Anyone can do it. You need to gather all your materials before you begin. You’ll need three glasses or beakers. You can use bottled or tap water. It’s better if it isn’t cold water. Warm water dissolves faster. A tablespoon, salt and three eggs will complete the materials. Be very careful not to break the eggs. It makes a really big mess! Now you can start the experiment. Fill three glasses with two cups of water each. Dissolve one tablespoon of salt in the first glass and two tablespoons in the second glass. Don’t put any salt in the third one. Label each glass. Watch the eggs for the next twenty four hours. When the time is up, take notes on how far the eggs have risen. Draw your own conclusion. This is a really cool science project. I got most of my information from sciencehound.com. I learned a lot about density and buoyancy. You can increase the density of water by adding salt. Eggs float at different levels in water depending on how much salt is added. If no salt is added, the egg just sinks to the bottom. It’s almost like doing a magic trick!
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