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Science · Stage 5

Investigate: A Mini Water Cycle

Seal water in a bag, change just ONE thing, keep the rest the same — then read the pattern in your droplets, like a real scientist!

✦ Science📘 Stage 5 · S5⏱ ~12 min🧒 Ages 9–10★ Free to start
I can name the variable I change and the ones I keep the same, and read a pattern from my data.
Start the free lesson →⬇ Printable PDF
Kavi the owl for Science
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Kavi's Water-Cycle Lab

Kavi tapes a row of sealed bags of water to the window 💧. "Inside each bag the sun warms the water — it evaporates, condenses into droplets on the plastic, and collects at the bottom, just like the real water cycle!" hoots Kavi. "I want to find out — does a SUNNIER spot make MORE droplets? To find out the fair way, I change just ONE thing — how sunny the spot is — and keep everything else the SAME: same water, same bag, same days. That one changed thing is my variable. Then I count the droplets and read the pattern in my data. Let's investigate!"

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What your child will learn

1What makes a test fair?To find out what ONE thing does, a scientist changes that one thing and keeps everything else the same. Tap each part to see how a fair test of the water-cycle bags works!
2Which do you change, which do you keep the same?Kavi is testing how the AMOUNT OF SUNLIGHT changes the droplets. In a fair test you change ONE variable and keep every other thing the same. Try it!
3Read the pattern in the dataKavi counted the droplets in each bag and drew a bar for each. Read the bars from left to right — the sunnier the spot, the more droplets formed. That rising trend is the pattern in the data.
4Is it a fair test?Decide like a scientist. Predict each one, then tap Next test → for more!
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A peek inside

I want to find out if a WARMER spot makes the water in my bag evaporate faster. What is the ONE thing I should change?
A fair test changes only the one thing I am testing. Here I am testing warmth, so I change how warm the spot is and keep everything else — the amount of water, the bag, the days — the same.

Try this at home: In a fair test, how many things should you change at one time?

Ready to play and learn?

Start the free interactive lesson, or print the handout for screen-free play.

Start the free lesson →⬇ Download PDF

Part of Science · Stage 5 · S5 on KAVI Academy — a secular, whole-child learning platform for ages 5–12.