While water is boiling vigorously in an open pot over a flame, what happens to its temperature?

While water is boiling vigorously in an open pot over a flame, what happens to its temperature?
  1. It increases continuously
  2. It decreases to $0^\circ\text{C}$
  3. It remains constant at $100^\circ\text{C}$
  4. It fluctuates unpredictably

Solution

During a change of state at boiling point, all supplied heat is used to change liquid to vapor, so temperature remains constant.

Asked in: Homi Bhabha Practice

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