fluid_mechanics.gif (14060 bytes)

GLASS OF WATER AND A CARD






EQUIPMENT
    redball.gif (326 bytes) Glass completely filled with water
    redball.gif (326 bytes) Playing Card
 


NARRATIVE
            Atmospheric pressure can hold water in an inverted glass. Fill a glass COMPLETELY full of water. Slide a card over the mouth so that no air is in the glass. Slowly invert the glass while holding the card against it. When inverted, remove the hand from the card. The water will be kept in the glass by atmospheric pressure.

                This demonstration takes some practice to do.