A pressure cooker works on which principle?
Correct answer: C. Increase in external pressure increases the boiling point
- A. Decrease in external pressure increases the boiling point
- B. Increase in external pressure decreases the boiling point
- C. Increase in external pressure increases the boiling point
- D. None of these options are correct
Explanation
A pressure cooker is a closed container. The vapours of water formed are not allowed to escape. They develop more pressure in the cooker and the boiling temperature increases. So, the pressure cooker works on the principle that as the external pressure increases the boiling point also increases.
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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