halloween, suface tension of water.
I did an experiment on the suface tension of water.
1. Fill the sink with cold water
2. Sprinkle talcum powder about half inch thick over the top.
3. Dip your finger in the water, as if making *holes*
WHAT HAPPENS: The talcum powder show up the surfice tension of the water. So, as soon you finger pierces the suface tension, you can see the "hole" closing again
BECAUSE: The suface tension is a strong force it is broken only momentarily when you pierce it with your finger.
4.Now put a drop of liquid soap on your finger (do this away from the sink) then put your finger into the water again,
5.Make holes in the water
WHAT HAPPENS: the first time you dip your finger in the talcum powder moves away, dip it in again, and the finger will leave a "hole"
BECAUSE: the soap loosens the tension at the place where you dip your finger. On the rest of the suface the tension is stronger so this attracts and holds back the powder. The "holes" made by the soapy finger do not close again because the soap prevents the water molecules from joining together again, so the suface "skin" cannot regain it’s unbroken state. If you want to repeat the experiment you will have to change the water.
HALLOWEEN!!!!
Me face painting
play doh!
Me sitting on a metal toy house, in a playground
