This morning when you entered into the schoolyard, have you also noticed all these wonderful colored leaves on the trees and on the ground? I looooove jumping in them! That's so much fun! Autumn is my favourite season!
I was wondering if you could help me to show how much I actually love Autumn...
Check the following video to see what it is all about:
So, how does this work?
What do we need to repeat the experiment at home or in class? Do you remember?
We need:
- A tray or bowl full of water
- Aluminium foil
- Liquid soap
- A toothpick
The experiment:
- Fashion a boat out of the aluminium foil
- Put your boat into the bowl full of water
- Add some liquid soap and the end of your boat with
the help of the the toothpick
- Observe what's happening!!
How does it work?
Soap is a surfactant and breaks down the surface
tension of water. As the surface tension is broken up, it creates enough
of a force to push the lightweight boat across the surface. Once the the
water’s surface tension will be in equilibrium, there no more force provided
and the boat may also sink depending on the model ;)
