Science - Barometer

Today, we made a barometer.  We talked about air pressure and how it effects your ears.  We also discussed 1 atmospheric pressure below -underwater.

Materials:
 Soda Bottle
 Straw
 Balloon

Barometer:  Directions
 Place a balloon over the top of the soda bottle. Cut a small hole in the center of the balloon.
 Cut a straw at an angle to make a pointer. Place the straw in the center of the  balloon.
 Fill a sink full of water.  Place the soda bottle directly underwater.  The soda bottle will be 1  atmospheric pressure below. The straw will move because of the  pressure.