Like HowStuffWorks on Facebook!

Science Projects for Kids: States of Matter


Cut and Connect Water Drops
Cut and connect water drops.
Cut and connect water drops.
©2007 Publications International, Ltd.

Try to cut and connect water drops in this science project for kids on states of matter. You can split a water drop into smaller drops, and you can put small water drops together. Give it a try, and you'll learn more about the surface tension of liquids.

What You'll Need:

  • Food color
  • Glass
  • Water
  • Spoon
  • Eyedropper
  • Waxed paper
  • Toothpick
  • Drinking straw

Step 1: Put a drop of food color into a glass of water; stir until all of the water is evenly colored.

Step 2: Using an eyedropper, gently put several drops of the colored water onto a sheet of waxed paper. Look at the circular shape of the drops.

Step 3: With a toothpick, try to cut a water drop in half. Can you do it?

Step 4: With a drinking straw, blow gently to try to put two water drops together. Can you do it?

What Happened?

The surface tension of water pulls the water molecules in a drop toward each other. The molecules in the outer layer are drawn in toward the center of the drop, giving the drop its round shape. The surface tension that holds the water in that shape affected how the water acted when you exerted force on it with the toothpick and the straw.

For more fun science projects for kids, check out:

ABOUT THE DESIGNERS

Cloud in a Bottle by Maria Birmingham, Karen E. Bledsoe, and Kelly Milner Halls


More to Explore