When adsorption hysteresis is observed, the desorption equilibrium pressure is _________________ that obtained by adsorption?
Correct answer: B. Always lower than
- A. Always higher than
- B. Always lower than
- C. Same as
- D. Dependent on the system; can be either lower or higher than
Explanation
In the usual adsorption hysteresis associated with capillary condensation, the desorption branch occurs at a lower equilibrium pressure than the adsorption branch for the same loading. This pressure difference produces the hysteresis loop.
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