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ICSE Class 8 Physics Question 7 of 14

Matter — Question 8

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Question 8

Describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature.

Answer

The following experiment demonstrates that water absorbs heat during boiling at a constant temperature —

Describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature. Matter, Concise Physics Solutions ICSE Class 8.
  1. Take a beaker and pour some water in it.
  2. Place the beaker on a wire gauze placed over a tripod stand.
  3. Clamp a thermometer in a vertical stand and insert it in the beaker.
  4. Heat the beaker over the flame of a burner.
  5. Record the temperature of water after every minute.

Observation — The temperature of water gradually rises and when it reaches 100°C, water starts boiling. Once the water starts boiling, its temperature does not rise any further, although heat is still being supplied.

Conclusion — From the above experiment we can conclude that, at 100°C water begins to boil and changes into steam by absorbing the heat being supplied to it without further rise in temperature.