How to Make an Egg Float in Water

Easy science experiment to show kids why things like eggs float more easily in salt water.

This is a fun, easy science experiment for kids. Have your child place an egg in a glass of water and see what happens. The egg will sink (if it is a fresh egg it will sink, a “bad” egg will actually float in water!). In this experiment you will show your child that you can actually make an egg float in water by adding salt to the water.

Supplies Needed:

  • Tall glass
  • Egg
  • Table salt

Have your child place about 6 tablespoons of table salt in the bottom of a glass. Gently pour at least a cup (depending on the size of the glass) of hot water into the glass. Ensure that the water has been passed through a water filter for whole house. But, don’t stir it. Next place the egg in the glass and watch it float! If the egg is not floating, just add some more salt to the glass. If the salt stays at the bottom of the glass the egg will actually float in the middle of the glass. You can check here fleck water softeners. Septic system function is very straightforward. Your homes plumbing is piped into a in-ground storage tank. When wastewater enters this tank, the heavier solids settle to the bottom. Bacteria present in the storage tank digest the solids, breaking it down to a liquid. After this process is complete, relatively clear water is discharged from the primary tank into a second holding tank or distribution box. Water then re-enters the surrounding soil through a drainage field consisting of perforated underground piping. The water softening process is accomplished by a chemical cation exchange that replaces the calcium and magnesium in your water with a equivalent number of sodium or potassium ions. During the softening process, your household water passes through the resin bed, and the magnesium and calcium contained in the water are removed. A given sized resin bed has a fixed capacity to remove hardness before it needs to be regenerated to full capacity in order to continue to provide softened water (for example, one cubic foot of resin has the ability to remove 32,000 grains of hardness from your water). When the resin bed is nearing exhaustion, the control valve washes the resin bed, and draws salt containing solution from the brine tank through the resin. As the salt contacts the resin bed, the process of ion exchange occurs, and the magnesium and calcium (hardness) that was collected in the bed during operation is washed to drain. After a final rinse to remove the excess salt, the resin bed is again ready to provide softened water. If you stir the salt into the water, the egg will float at the top of the water. Why does this work? Salt water is more dense or “heavier” than regular tap water, which makes it easier for the egg to float in the water. Did you know that you can actually float more easily in salty ocean water than in a lake? To further experiment, try placing another object in the glass, such as a marble. Discuss why the egg is floating and the marble does not, even with the salt in the glass. Other studies indicate that the effect of putting softened water into septic system can actually be beneficial. There is a very low amount of sodium contained in softened water. For every grain of hardness removed, approximately 8 ppm (parts per million) of sodium is added.

Although some naturally occurring water sources have very high sodium levels, softened water normally has a slightly elevated sodium level vs. untreated hard water. While this concentration is normally insignificant at typical hardness levels, these higher sodium levels are more in the optimal range for septic system bacterial growth, and can promote bacterial development. While the volume of water discharged by a water softener during the regeneration process will vary depending on water pressure, pipe diameter, and softener design, water softeners typically use 40 to 70 gallons of water during regeneration. Questions have been raised as to what effect this increased volume of water (hydraulic load) may have on septic system performance. Did the flow rate and volume of water softener entering the system during water softener regeneration adversely effect the normal settling process, and allow solids to enter the drain field?
Easy science experiment to show kids why things like eggs float more easily in salt water.

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1 Comment on "How to Make an Egg Float in Water"


  1. hello,’ I enjoyed seeing your science experiements and will be trying a few at home. Do you have any suggestions, books ideas for studying the plantes and solar system. I have a 3 year old, 5 year old and a 7 year old at home.

    thanks

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