Neither did we. But it’s true: Lemons float and limes sink!
After we discovered this we predicted which objects would float and which objects wouldn’t float. Then, we investigated.
In our investigation, we learnt that whether an object floats has nothing to do with its weight, but its density. For example, in our investigation, we found that an empty can of coke floats and a full can of diet coke floats despite being heavier. Furthermore, a tiny paper clip didn’t float.
Right at the end of our lesson, some of the children enquired further:
- “If you put something that sinks on top of something that floats what happens?” (Pippa)
- “Do boats have sides to stop the water getting in and making it heavier?” (Edward)
We hadn’t planned to but we investigated it anyway – science is fun and we should enquire and investigate as much as possible. Ask your child what we found out!
Ask your child why a lemon floats but a lime sinks. They should be able to give you a ‘text-book’ answer including the words ‘density’ and ‘particles’.
