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Calorimetry — Physics STD 10 — Question

ICSE BoardEnglish MediumSTD 10PhysicsCalorimetry3 Marks
Question
Water boils at 120 °C in a pressure cooker. Explain the reason
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Answer

  • The boiling point of a liquid increases with the increase in pressure and decreases with the decrease in pressure.
  • The boiling point of pure water at one atmospheric pressure (= 760 mm of Hg) is 100 °C.
  • In a pressure cooker, the water boils at about 120 °C to 125 °C due to increase in pressure, as the steam is not allowed to escape out of it.

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