Multiple choice

Water is used to extinguish fire because water

  1. raises the ignition temperature of the burning substance

  2. lowers the ignition temperature of the burning substance

  3. cools the burning substance to a temperature below its ignitions temperature

  4. conducts the heat
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When water is poured over the burning substance water absorbs heat from the substance. Because of this the temperature of burning substance falls below its ignition temperature and it stops burning.

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