Down the Spout
made of cloth
1. Fill the pitcher halfway
with water and add food coloring.
2. Soak the string for a moment
in the water, then take it out and let it drain back into the pitcher.
3. Tie one end of the string
to the handle of the pitcher.
4. Set the glass on a flat surface
approx. 2 feet away from the pitcher.
5. Slowly pour a trickle of colored
water down the string and into the glass.
1. What did you expect to have happen?
was it necessary for the string to be wet?
forces were holding the water to the string?
4. What other materials can be used in place
of the string?
it possible to pour other liquids along a string such as vegetable oil or soda pop?
If so, would you expect the same results?
molecules of some substances are attracted to the molecules of other substances. This
is called adhesion. When the string is wet, the water molecules are attracted
to the molecules of the string. Once the string is wet and more water is poured
down it, the water molecules on the wet string and the molecules of the water being poured will cling together. This is called cohesion. Water is a cohesive substance.