We have made and activity with water, a glass, an ice cube, sodium bicarbonate and thread.
First, we put the ice in the water, then we add some sodium bicarbonate and we put a piece of thread on it. If you do all the things well when you pull the thread up ice cube will be fixed in it.
https://drive.google.com/file/d/0B5WZHDC5pZ-zbk9RUWgxekRYVnM/view?usp=sharing
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