Education Through Entertainment

How to Make a Water Cycle in a Bag | STEAM Activity for Kids

Posted on Tue, Jul 12, 2016

Do your kids ask you why it rains?  Or maybe how clouds happen?  Spend an afternoon teaching them with this easy to do science experiment where you and your kids will make a water cycle in a bag!

Water Cycle In a Bag Science Experiment for Kids

This is also a great activity for elementary science classes.  Imagine your window covered in your student's shimmering water cycle experiments!

Follow these simple, step-by-step directions to create something fun (and educational) with your kids today.

Watch this video to see how it's done:

Step 1: What You'll Need

You need just a few common household items to create your water cycle display:

  • Plastic zip lock-style bag

  • Permenant marker(s)

  • Water

  • Blue food coloring

  • Clear tape

You'll need food coloring, water, a plastic bag, a permenant marker, and tape

Step 2: Decorate the Bag

Before you do anything else, decorate your bag!

Use your permenant marker (washable markers will wash right off) to draw a sky in the upper half of your plastic bag.  Include clouds and the sun, as they are important elements to the water cycle.

Decorate your Plastic Bag with a Permenant Marker

Step 3: Prepare the Water

Next, fill a cup with regular tap water.  Then add a couple of drops of blue food coloring to it to make it stand out.  Swirl the cup of water a few times to mix the coloring until it's a nice, solid blue.

Now, carefully pour the water into the plastic bag and zip it closed.  Make sure it's nice and tight!  You don't want any water to be able to escape.

Pour the water into the bag

Step 4: Hang Up the Bag

Once your water has been added to the bag and it's sealed up, it's time to hang it up on a window!  Pick a window that gets a lot of sunshine for best results.  Cut two long pieces of tape and stick them to the corners of your bag.  Then, press the tape tightly to the window - you don't want your bag to fall down!

Hang up your bag and observe the water cycle in action!

Step 5: Wait and Observe

Wait a couple of hours and check on your experiment.  You should see a change in your bag between two hours and 1 day (depending on the amount of sun and the time of day you started).

Eventually, you will begin to see droplets of water sticking to the side of the bag.  Some of these will be up high (in the clouds) while other droplets will be on their way back down (like rain).

Why is this happening?  It's because the water in the bag is being heated up against the sunny window.  That water turns into a gas through the process called evaporation.  In nature, evaporated water vapor goes into the atmosphere, but in our bag, it has nowhere to go, so it ends up sticking to the sides of the bag, turning back into a liquid as condensation.  That condensed water then slides back into the pool of water below as "rain".

Keep checking back on your experiment a few times a day, or anytime it's sunny to see the water cycle progress!

With some simple materials and a weekend afternoon, you and your kids can have a great time learning about the water cycle together.

If you enjoyed making your Water Cycle in a Bag, try our other Building Up STEAM activities and experiments!

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About Mobile Ed Productions:

Mobile Ed Productions, Inc. has been in business since 1979, producing educational, entertaining school assemblies and hands-on workshops.  Based out of Michigan, the company creates, designs, markets and distributes innovative ways to make learning fun in the form of live presentations and interactive exhibits.

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Topics: ideas for STEAM, DIY, Building Up STEAM, Rainy Day Activity