Super Science Friday

We are investigating why sea water is salty. We are also looking at concepts such as floating and sinking and density.

Our experiment was predicting if an egg would sink or float in fresh and then salt water.   We discovered that the egg sunk in fresh water and floated in salt. We discussed why. Some ideas included

The salt pushes the egg up.

The egg is lighter in salt water. 

Then we mixed salt water and carefully added freshwater over the back of a spoon. We predicted what would happen if we added an egg. The children predicted it would float sink.  And it did. The egg floated in the middle. Try it at home. The water must be very salty - about 6 table spoons per cup.