Floating Grapes Experiment

B and I used this to play a ‘magic’ trick on daddy and R.

In the kitchen, we filled up two glasses with warm water. In one of the glasses we added and stirred in sugar until it dissolved. Then we took the glasses outside to the table where daddy and R were.

R placed some grapes into the glass without the sugar. These grapes sank straight to the bottom. B told him that he could make his grapes float. R was like, “As if!” 

B carefully placed his grapes into his glass that contained the sugar and Voila! The grapes floated. R and daddy were very surprised.

This activity has to do with the density of the grapes compared to the water and the water with sugar mixed in it.

The grape is denser than the water in the glass without the sugar, therefore it sinks. When you add the sugar to the water, you are adding matter to the cup and making the water denser than the grape, which allows the grape to float.

Eventually, we did tell daddy and R how we managed to make the grapes float.