CAAS SAR-66 Module 2 Physics Practice Questions - CAAS SAR-66 Basic Knowledge Examination - Module 2 Physics Exam

Why does liquid mercury form a concave-downward (convex) meniscus when placed in a glass tube?

Cohesive forces between mercury atoms are stronger than adhesive forces between mercury and glass. Adhesive forces between mercury and glass are stronger than cohesive forces within mercury. Mercury has zero surface tension at room temperature. Mercury reacts chemically with glass to form a positive pressure gradient.

Correct Answer:

Cohesive forces between mercury atoms are stronger than adhesive forces between mercury and glass.

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