Science Extension Week 4

Today in Science Extension we looked at how temperature can change wind currents (and ocean currents)

We also investigated surface tension and were amazed how a drop of soap could break the tension on the surface of a bowl of water so quickly.

After this, we investigated how a disposable nappy retains 'water'. We found out what polymer was and how much it expands.
This is what we used

• Disposable nappy (unused is best)
• Zipper-lock bag
• Scissors
• Water
• Newspaper

 This is what we did 

•  Carefully cut through the inside lining and removed all the cotton wool-like material. Placed all the stuffing material into a clean, zipper-lock bag and zipped it up
• Only a little (less than 2 teaspoons full) of polymer ended up at the bottom of the bag. We then carefully removed the cotton wool from the bag.
• Then we added water, slowly, and recording how much. It was amazing how much the polymer expanded!