(MICHAEL KEARNEY, STAFF WRITER)
Today we’re going to do three simple experiments that have to do with surface tension and water. You might be surprised at some of the results!
What you will need:
PHOTO: MICHAEL KEARNEY, TAIPEI TIMES
A paper towel or some tissue
A plug for the sink
EXPERIMENT ONE 實驗一
► Fill the cup to the very top with water. The water should be flat and look like it’s about to overflow.
► Guess how many coins you can add before the water overflows.
► Now start adding coins one by one. Drop the coins in carefully. You don’t want to disturb the water too much.
► How many coins did you add? Was your guess close? How does the surface of the water look?
EXPERIMENT TWO 實驗二
► Fill a cup about three-quarters full with water. Drop in a paperclip. What happens?
► Now tear off a small piece of the paper towel. Put a paper clip on top of it and carefully place it on the water surface.
► Wait for the paper towel to be saturated with water. It should sink to the bottom. If it doesn’t, give it a slight nudge with the tip of a pencil or some other pointy object. Be careful not to disturb the paperclip.
► The paperclip should float on the surface.
► Add a drop or two of soap to the water. Don’t hit the paperclip. What happens?
EXPERIMENT THREE 實驗三
► Fill the sink about halfway full of water. Make sure there’s no soap in the sink.
► Make a small boat using the aluminum foil. Place the boat in the water. Wait for it to stop moving.
► Drop a few drops of water behind the boat. What happens?
► Now try dropping a few drops of soap behind the boat. What happens?
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