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Water is heated from below but not from ...

Water is heated from below but not from top. Why?

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When water is heated from the bottom, its density decreases and it rises. Cooler liquid from the upper part moves downwards and hence, the water gets heated up due to convection currents. But when heated from the top a very small amount of heat is carried to the bottom as the water is a poor conductor of heat. So, water is always heated from the bottom.
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MODERN PUBLICATION-THERMAL PROPERTIES OF MATTER-REVISION EXERCISE (SHORT ANSWER QUESTION)
  1. How specific heat capacity of a substance varies with temperature?

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  2. Two bodies of specific heats C(1)andC(2) having same heat capacities ...

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  3. Triple point of water is

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  4. What is critical temperature? Can a gas be liquefied at any temperatur...

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  5. What do you mean by latent heat of fusion and latent heat of vaporisat...

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  6. The relation between principal specific heats of gases at constant pre...

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  7. Mention atleast three applications of conductivity in daily life.

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  8. What are the basic differences between , conduction, convection and ra...

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  9. Distinguish between natural and forced convections. Give one example o...

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  10. Distinguish between land breeze and sea breeze.

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  11. Water is heated from below but not from top. Why?

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  12. What are thermal radiations? Write their basic characteristics.

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  13. GREEN HOUSE EFFECT

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  14. Green house effect is caused by

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  15. What is a black body ?

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  16. What do you mean by Kirchhoff's law? Discuss at least two applications...

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  17. State and explain Stefan's law.

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  18. What do you mean by Wien's displacement law? What are the units and di...

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  19. On a hot day, a car is left in sunlight with all the windows closed. A...

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  20. Why bottoms of cooking utensils are blackened and tops are polished?

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