What is the relationship between boiling point and External pressure?
Correct answer: A. Boiling point increases if external pressure is increased
- A. Boiling point increases if external pressure is increased
- B. Boiling point increases if external pressure decreases
- C. Boiling point is not affected by external pressure
- D. Boiling point decreases if external pressure increased
Explanation
The boiling point is the temperature when the internal/vapor pressure of the liquid becomes equal to the external/atmospheric pressure. If external pressure increases, the vapor pressure must increase as well and become equal to the external pressure for the liquid to boil. As temperature increases the vapor pressure increases and vice versa.
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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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