The partial pressure exerted by the water vapours is called_______________?
Correct answer: B. Aqueous tension
- A. Surface tension
- B. Aqueous tension
- C. Vapour pressure
- D. Hydraulic pressure
Explanation
The pressure exerted by water vapour is its vapour pressure; when measured in the presence of another gas, it is also commonly called aqueous tension. A student may choose surface tension because both involve a liquid surface, but surface tension is a force per unit length, not a vapour pressure.
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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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