Teach your kids about three forces – gravity, adhesion, and cohesion – with one nifty experiment! You see, water molecules are attracted to each other. This is called cohesion. Water molecules are also attracted to other molecules, like the ones in the string. This is called adhesion. The force of gravity pulls the water down, and the water “sticks” to the string when you pour because of adhesion and cohesion. Go ahead, give it a try! It’s easy, and it looks pretty darn cool!
What you need:
Pitcher of water
What you do:
Step 1: Add a few drops of food coloring to the pitcher of water, and stir to mix.
Step 2: Cut a piece of string about 60cm (2′) long.
Step 3: Soak the string in the colored water.
Step 4: Working over the tray, press one end of the string against the inside of the pitcher’s spout. Press the other end against the inside of the cup. Make sure you pull the string so it is tight.
Step 5: Position the pitcher higher than the cup, and carefully pour. Can you get the water to pour along the string into the cup?
Written By: “Cosmic” Christine, Chief Mad Scientist, Mad Science of so NH & no MA
Who is Mad Science? Mad Science is the world’s leading provider of science enrichment programs for children. We deliver unique, hands-on science experiences for children that are as entertaining as they are educational. We offer a large selection of programs including After-School Programs, Birthday Parties, Science Shows/Assemblies, Summer Camps, and Workshops for libraries, schools, scouts and more! We bring science fun to you! Wanna see us in action? Watch this brief video to learn more about us.