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 works on the principle that increasing the external pressure increases the boiling point.The boiling point of a liquid is the temperature at which the vapor pressure of the liquid is equal to the atmospheric pressure. When the atmospheric pressure is increased, the vapor pressure of the liquid also increases, which means that the liquid needs to be heated to a higher temperature in order to boil.A pressure cooker works by sealing the food inside a pot and then increasing the pressure inside the pot. This causes the vapor pressure of the liquid to increase, which means that the food can be cooked at a higher temperature. This results in faster cooking times and more tender food.So the answer is increase in external pressure increases the boiling point.
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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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