Multiple choice

Consider the following statements:

  1. Hot water extinguishes fire more effectively than cold water.
  2. When vapour condenses into liquid, it absorbs heat.

Which of the given statements is/are correct?

  1. Only 1

  2. Only 2

  3. Both 1 and 2

  4. Neither 1 nor 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Statement 1 is correct. The fire extinguishing involves absorption of heat. The absorption of heat in converting hot water to steam is higher than the heat absorbed in heating cold water to the boiling temperature. Hot water readily converts to steam absorbing enormous amount of heat and therefore hot water is better for fire extinguishing purpose than cold water. Statement 2 is incorrect. When vapour condenses into liquid, it liberates heat.

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