Actually, they do not float. The surface tension of water can hold small and light weights. As the iron fillings are small and light enough not to break the surface tension of the water, they just lie on top. If you pushed them to the bottom of the water, they will stay there.

How do you get iron filings out of water?

Explanation: Collect the iron filings on a frit, and wash the filings with a bit of cold water, and a bit of ethanol to drive off the water, and then air dry. Job done.

How does iron filings react with water?

Explanation: When you added the water to your bag, a chemical reaction took place. It was the result of oxygen in the air and water mixing with the iron filings. ... Since oxidation produces heat, then it is known as an exothermic reaction.