Super Star Scientist

Douglas!

Experiment:  Floating Egg

Objective:  The egg floats in salt water because salt water is more dense than the egg.

Douglas was ready to show us his experiment and had 2 assistants (Mom & Dad) by his side.  He had on his lab coat & goggles and had his materials set up! 

His materials were:  an egg, water, salt, and a tall glass.

 First, Douglas put plain water in a glass and placed the egg in the water. 

The egg sunk to the bottom.  He pulled it out.

Next, Douglas added 4.5 tablespoons of salt to the water.

He stirred and stirred until the salt dissolved.

After stirring, Douglas put the egg back into the water…

…and this time it floated!

Look how fun the egg looks…they drew on it to look like a SCUBA diver!

Douglas took his experiment an extra step.

After taking out the egg, his assistant added more plain water.

And look what happened...

The egg floated in the middle of the glass!

Douglas…what fun experiment!

This would be a great one to try at home!

You did a super job and taught us so well!

Conclusions:  

1.  The egg sinks in fresh water because water is less dense than the egg.

2.  When salt is added, the egg floats because the water becomes more dense than the egg.

3.  When more water is added, the egg floats in the middle of the glass because the egg is less dense than the salt water but more dense than the fresh water.