Sink or float experiments are always a hit, and plastic Easter eggs make them even more fun. Kids fill the eggs, predict and test.
It’s a simple, hands-on way to explore buoyancy and density with stuff you already have.
How to Do the Sink or Float Easter Egg Experiment
Easter Snap Cube Task Box
Get the printablePlastic Easter eggs
Small objects like pennies, paper clips, cotton balls and small toys
A large tub of water
Paper for recording predictions
Towels
Fill the tub
Fill a tub with water deep enough to cover an egg.
Pick objects
Give kids a pile of small objects of different weights and sizes.
Predict
Before testing, guess whether each filled egg will sink or float and write it down.
Test
Fill an egg, close it and gently set it in the water.
Compare
Record what happened and talk about why. Was your guess right?
Safety note
Stay close to young kids around any water, and watch little ones with small objects like coins.
Ways to Extend the Experiment
- Talk about density: Heavy things for their size sink. Light things for their size float.
- Find neutral buoyancy: Try to make an egg that hovers in the middle.
- Try other liquids like salt water or oil and compare.
- Add math: Count how many sank and floated and make a tally chart.
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More Easter fun? Our Easter play dough challenge cards are a hit.
The task box includes
- Easter snap cube task cards
- Instant PDF download, nothing is shipped
Perfect for
- Easter and spring
- Preschool and kindergarten
- Math centers
Sink or Float FAQ
An empty one floats because it’s full of air. Add heavy objects like coins and it sinks.
Density. Objects heavier than the water they push aside sink, and lighter ones float.
About 3 and up, with supervision around water.
When an object neither sinks nor floats but hovers in the water.
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From families like yours
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We love seeing these activities out in the wild: the lumpy letters, the snack breaks, the proud “I made a B!” moments. Leave a star rating, tell other parents what worked (and what totally didn’t), and add a photo of your setup if you’d like.
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