Water Cycle Experiment: Rain Cloud in a Cup

Simple Science Series: Water Cycle Experiment for All Ages (Lesson Plan Included)

Here’s proof that we’re always learning; I didn’t realize until I was an adult that I LOVE science. And you know what taught me that? The opportunity to learn more about it alongside my kids as a homeschool mom!

If you are also a homeschooling mom, I bet we’d agree that nothing beats a simple, hands-on science experiment—the kind that doesn’t require a ton of prep time or a long shopping list! The kids don’t know the difference, and keeping things simple for ourselves means that hands-on science projects can actually happen in the course of a regular day!

Today’s experiment demonstrates the water cycle in a way that is accessible for all ages, with very minimal set-up time. Seriously, you’ll find everything you need between your freezer, sink, and kitchen cabinet in about 10 minutes (I promise). I’m also including a lesson plan to go with the experiment to make your day a little simpler!

Hands-on science is a great way to capture a child’s focus and make learning memorable. Looking back on my time as a homeschooler and now a homeschool mom, the times we did hands-on crafts and science experiments are the memories that stand out to me most!

Now, you know as well as I do that, realistically, science experiments at home can look a little less than picturesque. Maybe you, too, have a crazy toddler getting into everything, or books and laundry filling the table, and a general lack of time to prepare “the laboratory.” Kids don’t care about such potential roadblocks to science experiments, but parents do, right? That’s why I’m all about simple hands-on science: finding ways to observe and discuss science at home, bringing it to life with as little prep as possible.

In this Simple Science Series, my goal is to keep things low-prep for us, the homeschool parent, while packing each experiment with wonder for young learners. I also want to make it simpler for you to enact right away by including lesson plan suggestions, discussion questions, and key terms to know!

Today’s water cycle experiment uses hot water and ice to illustrate condensation, cloud formation, and precipitation. It’s fun and simple! While this lesson is aimed at children in a lower to middle elementary age bracket, 1-3 grade, it is definitely one that all ages can enjoy.

Lesson Plan Suggestions to Set the Stage: Discussing the Water Cycle

Today’s simple, hands-on experiment demonstrates how the water cycle works! If you want to expand this into a full lesson, there are also some ideas below for setting the stage for your learners by defining, discussing, and drawing! Take as little or as much of this as you want/need!

Open up the Discussion

Whether you have older children who have studied the water cycle before, or little ones who never have, it’s always a good idea to start by asking the kids what they already know! Get the conversation going by asking your children questions like:

“Where does the rain come from?”
“What are clouds made of?”
“Is water always liquid? When is it not liquid?
“What happens to puddles after it rains? Do they stay there forever? Where does the water go?”
“Have you ever seen fog? Where do you think it comes from?”

Giving them the opportunity to talk about what they know will catch their attention and set the stage for discussion. Once you’ve discussed some of these questions for as long as you like, it will probably be a good time to define some key terms.

Define, Discuss, and Draw!

Hopefully, your conversation will open the door for introducing the three main stages of the water cycle. Depending on the age of your children, you may want to use a dry-erase board and do simple drawings to illustrate each of the following:

Evaporation: When water turns into vapor due to heat.

Discuss: When have your children observed this happening? Talk about a pot of boiling water on the stove that creates steam, or how those puddles on the ground heat up in the sun and seem to disappear. I’ve also pulled out something simple like an essential oil diffuser to illustrate vapor/evaporation.

Draw it! Either together or separately, see if you can draw an image that shows what evaporation looks like, or just a picture that represents what is happening, like the one below.

Condensation: Water vapor cools and changes back into droplets, seen in clouds.

Discuss: What are clouds made of? Did your children know that clouds are not solid, but made of something very similar to mist? Have they ever stood inside of a cloud (have they been on a plane or been outside on a foggy day?) Introduce cloud formation by explaining that clouds form when warm air rises, cools, and condenses into tiny droplets or ice crystals.

Draw: Have your children draw a picture of what happens when clouds form (this could just be a picture of clouds). You could even show/discuss some different types of clouds!

Precipitation: Water falls to the ground as rain, snow, sleet, or hail when clouds become too heavy.

Discuss: What different types of precipitation do your children already know? Which type is their favorite and why?

Draw: Divide a blank, white page into three sections. Have your children draw pictures of each type of precipitation: rain, snow, and hail. Alternatively, have them draw a picture of themselves in their favorite type of precipitation! (For my children, this would be snow, as we don’t get much of that here in the south!)

Water Cycle Experiment

Now that your children have had a chance to learn more about the water cycle, let’s get to our simple, fun hands-on element!

What You’ll Need:

This really is one of those you-have-everything-you-need experiments! Go to your kitchen and grab:

Ice cubes
A plate (thin and smooth is best)
A clear, glass cup
Hot water (from the tap)

Note: We used several different types of cups/plates/bowls after doing this experiment for the sake of experimentation. It can be fun to try different materials and shapes to see how that affects the outcome. The main thing is to make sure the cup you use for hot water is clear! For example, the plate below was very thick (Pioneer Woman, anyone?) and ceramic. We predicted it may not work as well because it was so thick, but actually the material got chilly quickly! I encourage you to play around with different plates for this one–that’s science, too!

Experiment Steps (10 minutes)

1. Fill a cup about ⅓-½ way full with hot water from the tap. Use a clear, glass cup or mason jar–something that will withstand heat and that you can easily see through!

2. Next, you’ll place a plate on top of the cup, making sure that it is a shape that will completely cover the opening.

Idea: Ask your children if they know why you are doing this!

When we were at this point of the experiment, my daughter automatically put her hand over the top of the glass cup before I could cover it. I asked her why, and she said “so the heat doesn’t escape out of the top!” Children observe more than we give them credit for sometimes. Asking them to make predictions along the way is a great way to set the stage for discussion (quickly of course, because we really don’t want the heat to escape or cool off at this stage).

3. Lastly, add several ice cubes to the top of the plate to make it cold.

4. With these things in place, gather around with your children to observe what happens! The condensation should start to form on the underside of the plate, and droplets begin to streak down the sides of the cup.

What Was Happening?

After observing the experiment, it’s time to discuss what happened! Use these questions to guide the discussion and help kids understand the science behind it:

Why do you think water droplets formed on the underside of the plate?
(Discuss how the warm water released vapor, and the cold plate caused the vapor to cool and turn back into water droplets.)

What do the streaks running down the sides of the glass remind you of?
(Explain how this mimics rain, which falls from clouds when condensed water becomes too heavy.)

What would happen if we used colder water instead of hot?
(Encourage predictions about evaporation and condensation differences.)

Can you think of other places where you’ve seen condensation like this?
(Guide them toward examples like foggy car windows, a cold soda can “sweating,” or dew on grass.)

Try This!

Now that you’ve done the experiment the regular way, encourage tinkering and curiosity by adding variations to the experiment (this is usually the kids’ favorite part anyway!) Here are some ideas to spark further exploration:

Change the Temperature: Use cold or room-temperature water instead of hot and compare the results. Does condensation still happen? How quickly?

Add Food Coloring: Add a few drops of food coloring to the water. Does it change how you see the water cycle process?

Experiment with Plate Shapes and Materials: Try using a metal, plastic, or ceramic plate instead of a smooth glass one. Try a different shape, like a bowl. Does the material affect how much condensation forms?

Double Up: Place two cups side by side—one with hot water and one with cold. Observe and compare the differences in condensation.

Additional Learning Activities

If you are embarking on a unit study on the Water Cycle, here are a few more ideas you can use to expand the learning!

Observation Walks: Take some short nature walks to look for signs of the water cycle in nature. Can you spot puddles evaporating, clouds forming, or condensation on a surface?

Water Cycle Art: Create a large poster of the water cycle, including evaporation, condensation, and precipitation. If you did drawings already, see if your child/ren can arrange them and add arrows and labels to illustrate the process.

Self-Watering Terrarium: This one is perfect for older kids learning about the water cycle. Plus, it’s creative and pulls in some botany, too!

Types of Clouds: Research and create a mini cloud identification chart. Draw or print images of cumulus, cirrus, and stratus clouds, and discuss how they form.

DIY Rain Gauge: Make a simple rain gauge using a clear jar, ruler, and some stones at the bottom for weight. Measure rainfall over the next week and track it on a chart.

Condensation Hunt: Challenge kids to find and photograph (or draw) examples of condensation around the house or outdoors.

Nature Journal/Weather Notebook: Have children keep a science journal where they write or draw observations from the experiment and other weather-related activities throughout the week.

Learn About Rivers and Streams! Expand your study of the water cycle into rivers, streams, and even oceans!

I hope this simple, hands-on science lesson inserted a little fun and learning into your homeschool day! Keep an eye out on the site for more easy, hands-on science projects and lesson plan ideas with this Simple Science Series!

What did your children think of this experiment? Do you have any additional ideas for learning about the Water Cycle to share with us in the comments?