Floating Grapes Density Science Experiment

In this fun and easy science experiment, we’re going to explore and investigate density by making grapes float. 

Materials:

• Several grapes
• Masking tape
• Marker
• Sugar
• Four drinking glasses
• Measuring cup
  
  

Instructions:

1. Place a piece of masking tape of each glass.
2. Label each cup #1 through #4 using the marker.
3. Fill the #4 glass part ways with warm water and stir in several tablespoons of sugar.
4. Test the sugar mixture and see if the grape floats. Keep adding sugar until the grape floats. Do not worry if there is a little sugar that does not dissolve completely.
5. Fill the #1 glass with warm water.
6. Place a grape in the #1 glass and observe what happens.
7. Fill the #2 glass with some of the sugar solution.
8. Place a grape in the #2 glass and observe what happens.
9. Fill the #3 glass with the remaining sugar water.
10. Next, carefully fill the rest of glass #3 with water. You want to do so in a way that does not disturb the heavier sugar water in the bottom of the glass. You may want to place a spoon just above the sugar solution layer and gently trickle regular water down over the spoon.
11. Now place a grape inside glass #3 and observe what happens.
    
    

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How it Works:

A grape is more dense than water and will sink in regular tap water. As sugar is dissolved into water, the water eventually become more dense than the grape. The grape will then appear to “float” on top of the more dense solution. 

Make This A Science Project:

Test other items that sink in water and then try to make sugar solutions to see if you can get the item to float. Try making solutions with salt or other items. 

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