But, 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. 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.
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. Observations and results Did the egg float in cup 1 and 2, but not in cups 3, 4 or 5? You likely saw that the egg floated best in cup 1, floated a little less in cup 2 but part of it was above the surface and did not float in the other cups. Cup 1 had the undiluted salty solution that you originally prepared, which was one half cup of salt in two and one half cups water total.
The concentrations of the salt solutions in cups 2 to 4 were halved as you increased in cup number; for example, the concentration of the salt in cup 2 was half that of cup 1, and the concentration of the salt in cup 3 was half again of cup 2.
Cup 5 had plain tap water. Simple science experiments show how salt causes things to float better. Take six containers of equal volume and add enough water to float an egg.
Add increasing amounts of salt to five containers while leaving the sixth with no salt. Measure how each egg floats below and above the water line. This makes the water denser and allows more objects to float on the surface that would sink in fresh water.
Salt in the ocean comes from rocks on land. The rain that falls on the land contains some dissolved carbon dioxide from the surrounding air. This causes the rainwater to be slightly acidic due to carbonic acid which forms from carbon dioxide and water. As the rain erodes the rock, acids in the rainwater break down the rock.
What household items float? Does paper float on water? What material can float on water? What causes a paperclip to float on water? Can you make a paperclip float with magnets? What happens when you put a paperclip in water? What accounts for a paperclip being able to float on top of water without sinking? Why does a motorboat float? Why does wood float on water while a stone sink?
Does Stone float or sink? Will a penny float in salt water? Can pennies float in water? Previous Article What is merit point? Back To Top.
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