Vapour pressure of a liquid can be measured by the Barometric method and Manometric:
Correct answer: B. Manometric method is more accurate than Barometric method.
- A. Barometric method is more accurate than Manometric method.
- B. Manometric method is more accurate than Barometric method.
- C. Both are equally accurate and applicable.
- D. Both methods are in use but are not reliable.
Explanation
Barometers are more limited in design and function than manometers, hence, manometers can calculate other pressures along with atmospheric pressure. On the other hand, barometers can calculate only atmospheric pressure. Manometric method are more accurate than barometric method because manometers are more accurate and therefore do not require definite level. The U-shaped manometers are more accurate because the level of high pressure gas on both sides helps in measuring the pressure of the liquid.
This question appeared on the ETEA MDCAT 2014 paper, which you can sit online with every answer explained.
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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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