Question
Download Solution PDFThe phenomenon of rise or fall of liquid level in a capillarity tube is called as capillarity. In non-wetting liquids (e.g. mercury), what is the relation between cohesion of mercury and adhesion between mercury and capillary tube?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- In case of mercury used in capillary tube cohesive force is predominates, so it does not wet the glass.
- Cohesive forces are force of attraction between molecules of same type.
- Adhesive forces are force of attraction between molecules of different type.
- In case of water adhesive force is stronger than cohesive force that's why it wet the glass.
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In case of mercury, due to higher angle of contact between glass & mercury ie θ > 90°, the meniscus formed is convex. Thus, cohesive force between mercury molecules is stronger, and mercury column will tend to shrink rather than rising upwards
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