2. Take a tumbler and fill it with water. Cover the mouth of the tumbler with


2. Take a tumbler and fill it with water. Cover the mouth of the tumbler
with a thick card similar to that of a postcard. Hold the tumblerwith one hand while keeping the card pressed to its mouth withyour other hand. Turn the tumbler upside down while keeping thecard pressed to its mouth. Make sure that the tumbler is heldvertical. Gently remove the hand pressing the card. What do youobserve? Does the card get detached allowing the water to spill?With a little practice you will find that the card continues to holdwater in the tumbler even after it is not supported by your hand.Also try this activity by using a piece of cloth to hold the tumbler inan upside down position (Fig. 11.21).​


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