Code Number: 2B30.45a
Demo Title: Inverted Jug or Pitcher - Spoof
Condition: Excellent
Principle: Water Columns and Atmospheric Pressure
Area of Study: Fluids
Equipment:
Jug and pitcher with side holes.
Procedure:
Fill the jug or pitcher with water. This may take a while as the water you initially place into the jug needs to drain into the inner compartment. When completely full, you may hold your finger over the outer hole and pour from the jug. Only a small amount of water will come out unless you remove the finger that is covering the hole.
If done properly, it will appear that you can pour out all the water from the jug, and it will magically refill itself when you set it down on the table.
Fill the soda bottle with water holding your finger over the hole in the side. Screw the cap on tightly and remove your finger showing that only several drips exit from the hole. Loosen the cap and observe the water stream.
References:
- Charles Vivian, "Your Magic Finger", Science Experiments & Amusements For Children, p. 62.
- Bobby Mercer, "Super Squirt Bottle", Junk Drawer Physics, p. 164.
Video Credit: Jonathan M. Sullivan-Wood