Students from the 2nd Primary School of Komotini conducted experiments to determine whether various materials would sink or float in water and salt water. They made predictions and recorded their assumptions on paper before performing the experiments. The materials tested included a coin, paperclip, empty plastic bottle, cork, and wood. Most of the materials sank in fresh water, except for the empty plastic bottle and cork which floated. When tested in salt water, the wood floated instead of sinking.

1. E-twinning programm
“I’m trying, exploring,discovering”
Water experiments
3rd week : Sink or float to water and salted
water ?
2o Nipiagogeio Komotinis

2. Do these materials sink or float to
water ? What does it happen to salted
water?

3. First we made assumptions, wrote them
in a paper and then did the experiment

4. Then we added a coin to water
Conclusion
1. Coin is
sinking to
water

5. Conclusion
2. Paperclip is sinking to water

6. Conclusion
3. The empty plastic bottle is floating to water.

7. Conclusion
4. Cork is floating to water

8. Conclusion
5. Wood is sinking to water

9. We drew in a table what happened.

10. What did happen when we throw the
above materials to salted water?

11. The wood is floating now