The temperature at which the vapor pressure of a liquid becomes equal to external pressure or atmospheric pressure is called as?
Correct answer: B. Boiling point
- A. Melting point
- B. Boiling point
- C. Freezing point
- D. Sublimation point
Explanation
The boiling point is the temperature at which the vapor pressure of a liquid becomes equal to the external pressure or atmospheric pressure surrounding the liquid. At this temperature, the liquid undergoes a phase change and starts to vaporize rapidly, forming bubbles within the liquid.When the vapor pressure of the liquid is lower than the external pressure, the liquid tends to evaporate slowly. As the temperature increases, the vapor pressure also increases. Eventually, at the boiling point, the vapor pressure becomes equal to the external pressure, allowing the liquid to boil and convert into a gas.
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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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