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GK QUESTION#3364

In the usual paper-cup demonstration, why can the water-wetted part of the cup resist catching fire while liquid water remains in it?

  1. AThe paper becomes non-flammable after absorbing water
  2. BThe water absorbs most of the heat and keeps the paper below its ignition temperatureCorrect answer
  3. CThe steam produced stops the burning process
  4. DThe outer surface of the cup becomes insulated by air
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Answer

B. The water absorbs most of the heat and keeps the paper below its ignition temperature

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Explanation

Water absorbs heat from the paper in contact with it. While liquid water remains, the wetted paper stays near the water temperature and can remain below its ignition temperature. This does not make paper permanently non-flammable: dry areas or an emptied cup can still burn.

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