Vapor pressure is measured by calculating the difference in liquid pressure and?
Correct answer: C. Atmospheric pressure
- A. Mercury pressure
- B. Glass pressure
- C. Atmospheric pressure
- D. Container pressure
Explanation
Option A) Mercury pressure and Option B) Glass pressure are incorrect because they do not have any direct relation to the measurement of vapor pressure.Option C) Vapor pressure or equilibrium vapor pressure is defined as the pressure exerted by a vapor in thermodynamic equilibrium with its condensed phases at a given temperature in a closed system. The equilibrium vapor pressure is an indication of a liquid's evaporation rate.Option D) Container pressure is also incorrect because the pressure exerted by the vapor in the container is a part of the container pressure itself. To obtain the vapor pressure, we need to subtract the atmospheric pressure from the total pressure exerted by the mixture of vapor and air in the container.
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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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