Protect the pirate coins - waterproofing activity

This is an easy waterproofing activity with a pirate theme.

We painted one side of the coin so we could easily see if the coin was wet and placed 5 coins in each bag ( paper, cloth, plastic ) before spraying with water and then examining the coins.

Don't forget I've got lots more early years themed science ideas you might like, including nursery rhymes, fairy tales and under the sea.

You'll need:

Coins

Washable Paint - optional, but helps the children to see if the coins are wet

Plastic bags

Cloth bags

Paper bags

Water

Spray bottles

Instructions

Ask the children to feel the bags and see if they know what material each is made from, before asking them to predict which will keep the coins driest.

Spray the bags one at a time with water. We checked the bags after 5 sprays and 10 sprays.

What do you notice? What happens if you shake the bag?

Results

Our paper bag split after shaking and the damp coins fell out after just 5 sprays of water.

After 10 sprays to the cloth bag we could see paint starting to seep into the outside of the bag, indicating that the coins were wet.

The coins in the plastic bag remained dry. We gave the plastic bag some extra sprays and observed that the water beaded on the bag and then rolled off.