Sink or Float Tub
A water tub full of household objects to guess, drop, and sort into sinks-or-floats.
Thinking
2–5 years
10–20 min
Calm
Some mess
At home
What you need
- Basin or tub of water
- 5-10 small household objects
- Two bowls or zones labelled sink/float
- Towel
Setup
- Fill a tub or basin with a few inches of water
- Gather small safe objects (spoon, cork, toy car, sponge, coin, leaf)
- Set out two zones or bowls: one for 'sinks', one for 'floats'
Play prompts
- Before we drop it in, do you think it will sink or float?
- Why do you think the spoon sank but the sponge floated?
- Can you find something else in the house to test?
Ways to change it up
- Test the same object dry vs. soaked to see if it changes
- Group objects by material afterwards (metal, wood, plastic)
Safety notes
- Supervise closely around water with toddlers
- Avoid objects with small parts that could be a choking hazard
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