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GOOD MORNING KIDS …..

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A KEROSENE LAMP BURNS

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INK COMES FROM THE PEN

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  1. Have you ever think , what makes kerosene rise through the wick in a kerosene lamp??

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  • How ink comes from the pen??

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THE RISING OF LIQUID AGAINST GRAVITATION IS KNOWN AS CAPILLARY RISE

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CAPILLARY RISE - THE RISING OF LIQUID IN A TUBE AGAINST GRAVITATION

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CAPILLARY DEPRESSION -

FALL OR DEPRESSION OF LIQUID IN A TUBE

- WATER

- MERCURY

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CAPILLARITY

  • The rise or depression of a liquid in a narrow tube or a minute hole

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Find examples of Capillarity

COTTON CLOTHES ABSORBS WATER

TEAR MOVING THROUGH TEAR DUCTS

FLOATING OF WOOD ON SURFACE OF WATER

WATER POURING FROM A BOTTLE

WATER AND MINERALS

RISE IN PLANTS THROUGH CAPILLARIES

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SUMMARY

  • The rising of water or liquid in a tube against gravitation is known as capillary rise.

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  • The depression of liquid in a tube is capillary depression

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  • The rise or depression of a liquid in a narrow tube or a minute hole is capillarity.

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REVIEW QUESTIONS

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1.Define capillary rise?

2. Define capillary depression

3.Define capillarity

4. Find more examples for capillarity

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FOLLOW UP ACTIVITIES

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  1. Why is the land ploughed before beginning of summer ?
  2. Why dampness spread on the wall during rainy season?

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PIECE OF CHALK USED TO BLOT INK