Boiling point of a liquid is a temperature at which:
Correct answer: C. Vapor pressure equals the atmospheric pressure
- A. Surface tension is greater than the atmospheric pressure
- B. Viscosity is less than the atmospheric pressure
- C. Vapor pressure equals the atmospheric pressure
- D. Viscosity equals the atmospheric pressure
Explanation
The temperature at which vapor pressure becomes equal to atmospheric pressure is called 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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