3. A beaker full of water is placed upside down in a tub of water. After placing a flexible straw under the beaker, a student blows through the straw.
b) What happened to the water in the beaker? Where did it go?
c) What replaced the water in the beaker? Where did it come from?
b) When the student blows through the straw, the air pressure inside the beaker increases. This higher air pressure pushes the water in the beaker down and out of the beaker. The water exits the beaker and spreads into the tub of water.
c) As the water in the beaker is pushed out, it is replaced by air. The air that the student blew into the beaker displaces the water, filling the space that was previously occupied by the water.