Want to know what to do with all that leftover Halloween candy? Try a science experiment! In her fun two-book series Candy Experiments, writer and mom Loralee Leavitt details over 140 experiments to try with kids ages seven to 10. Here’s one of our favorites.

Can You Float a Sunken Candy Bar?

Time: 10 minutes

Skill level: Medium

What you need:

•  1 mini Milky Way or Snickers bar, unwrapped. Make sure it’s not cracked or smashed

•  1 small clear glass with about 1 cup of water

•  Salt

•  Measuring cup and spoon

What to do:

1. Put the candy bar into the glass of water. Does it float or sink?

2. Remove the candy bar.

3. Add 3 tablespoons of salt to the glass. Stir until it’s dissolved.

4. Put the candy bar back into the glass. Now does it float or sink?

What’s happening: You’re getting a look at relative density! When a candy bar is denser than water, it sinks. But when you change the water’s density by adding salt, you make the water more dense and then the candy bar floats.

More Fun:

Can you make a Milky Way bar magically swirl to the surface? Try this: Pour 1 cup of water into the glass. Add 2 tablespoons of salt and stir until it dissolves. Add the candy bar. Then add another tablespoon of salt and gently stir the solution. Does it float?

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