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.
Materials
Coins
Washable Paint -optional, but helps the children to see if the coins are wet
Plastic bags
Cloth bags
Paper bags
Water
Spray bottles
Method
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.
Extension tasks
Can you fill up the plastic bag with water? What happens? Can you think of an instance where this is useful?
Can you try other materials?
Can you think of any materials that might be waterproof?
Suitable for Key Stage 1
Everyday Materials
Describe the simple physical properties of a variety of everyday materials
Working Scientifically
Observing closely, using simple equipment
Performing simple tests
Using their observations and ideas to suggest answers to questions
EYFS – Early Learning Goal
The child knows about similarities and differences in relation to places, objects, materials and living things.
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