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Physics

(a) What is the reason of spraying of water on the roads in the evening of hot summer?

(b) Explain the benefits of high specific heat capacity of water.

Calorimetry

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Answer

(a) Water has a high specific heat capacity of 4.2 Jg-1°C-1, hence, it absorbs more heat from the roads without much rise in its own temperature and the road gets cooled, so it is used for spraying on the roads in the evening of hot summer.

(b) As water has a high specific heat capacity of 4.2 Jg-1°C-1, hence, it absorbs more heat from the surrounding without much rise in its own temperature hence, some of its uses are:

  1. It is used as an effective coolant,
  2. Hot water bottles are used for fomentation
  3. It is used as a heat reservoir. In cold countries, wine and juice bottles are kept in water to avoid their freezing.
  4. Farmers fill their fields with water to protect the crops from frost.

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