What Does It Mean? 🤔
Let's learn together
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Capillary action is how water can travel upward through very narrow tubes or spaces, even though gravity is normally pulling everything downward. It happens because water molecules are attracted to certain surfaces and to each other.
Freddy set up paper towels folded into strips connecting cups of colored water. Over time, the colored water climbed right up the paper towels and traveled into the empty cups in between — all thanks to capillary action!
This same process is how real plants drink. Water travels up through tiny tubes inside roots and stems called xylem, climbing all the way up to the leaves at the top, even in a very tall tree.
See It in Action! 👀
Real examples
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Water climbs up a paper towel thanks to capillary action!
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Capillary action helps water travel up from a flower's roots to its petals!
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Ink moves through some markers and pens using capillary action!
For Grown-Ups! 👨👩👧
Help kids learn
👨👩👧 Teaching Tips
Letting kids watch the colored water travel over several hours (rather than expecting instant results) builds patience and reinforces that capillary action is a real, ongoing physical process.
🏫 Classroom Ideas
Set up the Walking Water Colors experiment as a long-term observation station, having students check and sketch progress every hour or so throughout the day.