MCQ
The pressure at which liquid and vapour can coexist at equilibrium is called the :
- ✓Limiting vapour pressure
- BReal vapour pressure
- CNormal vapour pressure
- DSaturated vapour pressure
✓
Answer
Correct option: A.
Limiting vapour pressure
Ordinary evaporation is a surface phenomenon $-$ some molecules have enough kinetic energy to escape. If the container is closed, then an equilibrium is reached where an equal number of molecules return to the surface.
The pressure at which this equilibrium where the coexistence of liquid and vapour is achieved is called the saturated vapor pressure.
The pressure at which this equilibrium where the coexistence of liquid and vapour is achieved is called the saturated vapor pressure.
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