13. Why is snow, which is made up of ice crystals, a much better insula- 14. A c

Question

13. Why is snow, which is made up of ice crystals, a much better insula- 14. A cold block of metal feels colder than a block of wood at the same tor than ice? temperature. Why? A hot block of metal feels hotter than a block of wood at the same temperature. Again, why? Is there any temperature at which the two blocks feel equally hot or cold? What temperature is this? 15, Give some good reasons why the equation H-Ae?T4 is valid only if the temperature is expressed in kelvins (rather than degrees Fahrenheit or Celsius).

Explanation / Answer

Problem 13)

New snow is composed of a high percentage of air trapped among the accumulated snow crystals. And air is bad conductor of electricity and act as an insulator, while in case of ice, there is no air between the particles. Since the air can barely move, heat transfer is greatly reduced.

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