Chemistry Liquids PMC 2021
PMDC Verified Question 50 of 73
Which instrument is used to measure the vapor pressure of a liquid?
A
Barometer
B
Manometer
C
Thermometer
D
Sphygmomanometer
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Manometer
Concept:

Specific instruments are utilized in chemistry to measure distinct physical properties of gases and liquids.

Formula:

$$ \Delta P = \rho g h $$

Solution:

  • A Manometer is a U-shaped glass tube partially filled with a liquid (usually mercury) used specifically to measure the pressure of trapped gases or the vapor pressure of a liquid within a closed flask.


  • A Barometer measures general atmospheric pressure.


  • A Thermometer measures temperature.


  • A Sphygmomanometer measures blood pressure in humans.


Why other options are incorrect:

Using a barometer for a closed-flask vapor pressure reading is structurally impossible; barometers are open to the atmosphere. Sphygmomanometers are medical tools.

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