Physics
Describe an experiment to demonstrate that water absorbs heat during boiling at a constant temperature.
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Answer
The following experiment demonstrates that water absorbs heat during boiling at a constant temperature —
- Take a beaker and pour some water in it.
- Place the beaker on a wire gauze placed over a tripod stand.
- Clamp a thermometer in a vertical stand and insert it in the beaker.
- Heat the beaker over the flame of a burner.
- 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.
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