We talked about water’s “skin” this week – the stuff that holds water together – also known as surface tension.
First to see surface tension, M chose to make the water in our bowl yellow, then he used one of the pipettes to drop the colored water onto the wax paper. We watched how the water rolled up into little balls:
Then M used the other pipette to place one drop of dish soap onto the balls of water: The soap broke the surface tension, causing the water to run. This is how water washes laundry, dishes, dirty little boys, etc. ;) The soap breaks down the water tension so the water can flow freely into all the crevices where dirt is. (We used the sponge to wipe up after this part.)
Then came the very cool part. :) Exploding colors! We poured a small amount of milk onto a saucer, then added one drop of each food color into it. See how the drops of colored water just sit in the milk?
Then we dripped soap into the saucer, and wow did the colors “explode” – really! It was pretty neat to watch, and both M and I were amazed at how quickly the color ran through the milk. It was lots of fun and M did this over and over again (that jug of milk was getting old anyway ;) ).
Have a beautiful day! :)