Science Projects And Inventions

YOU  NEED:

• A piece of string one foot (33 cms) long
• A glass of water
• A small pitcher

Are you aware that water can flow along a string as if it was a tube? Soak the string in water. Fill half the pitcher with water and tie one end of the string to the pitcher. The string should be pulled tightly over the Spout of the pitcher as in the illustration. Take the glass of water and tape the other end of the string inside it. After making sure that the string is taut, tilt the pitcher ever so slowly. The water will flow down the string and into the glass.

HOW DOES IT WORK?

As mentioned earlier water molecules tend to stick to each other. This is evident when the water is poured out of the pitcher. It comes out in a stream rather than plopping down. In normal circumstances the water molecules follow the pull of gravity and fall straight down. But if you use the wet string and pour slowly the Water trickles down the length of the string. Now this happens because the affinity of the water molecules for each other is greater than the force of gravity, which normally would have pulled the water straight down. Again the string attracts water molecules because the woven fibres in it create a lot of small spaces for the water to enter.