Suspenseful Eggperiment

Hailey is a budding scientist. For Christmas we got her the book "101 Cool Science Experiments". One afternoon this week she came and asked me if we could do the egg experiment. She was quite delighted with the process of forming a hypothesis, performing the experiment, and seeing the results. I was equally delighted to be teaching her a little about density with little mess or hassle! We are looking forward to the other 100 experiments to try over the summer.
The equimpment: A large glass half filled with water, 5 tablespoons salt, a spoon, and one raw egg.
First question- Me: "Do you think the egg will float or sink in regular water"? Hailey: " I think it will float".

Add salt. The book says to add 2 Tbsps, but we needed to add 5 Tbsps before the egg would float.

Stir salt until its dissolved completely.

Final question. Me-"Now what do you think will happen with the egg"? Hailey-" I think it will float!"

Hailey- " Why does that happen"? Me-"The egg is more dense, or it takes up more space than regular water. But if you add enough salt it will have less density than the water and can float".

Some fun facts we learned!
*The earth is covered by 75% water. Of that water, 97% is salt water.
*How does the salt get in the ocean? As water flows down the rivers, it picks up small amounts of mineral salts from the soil and collects in the ocean. The ocean water can only leave by evaporation or freezing as polar ice, but the salt stays dissolved in the ocean. As time goes on, it becomes more and more saltier.

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