What is the primary cause of capillary action in liquids?

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Question: What is the primary cause of capillary action in liquids?

Options:

Correct Answer: Adhesion

Solution:

Capillary action is primarily caused by adhesion, where the liquid molecules are attracted to the surface of the solid.

What is the primary cause of capillary action in liquids?

What is the primary cause of capillary action in liquids?

Step 1: Understand that capillary action is the ability of a liquid to flow in narrow spaces without the assistance of external forces.
Step 2: Recognize that this action occurs in small tubes or spaces, like the tiny gaps in a plant's roots or a thin straw.
Step 3: Learn that there are two main forces at play: adhesion and cohesion.
Step 4: Adhesion is the attraction between the liquid molecules and the surface of the solid (like the walls of the tube).
Step 5: Cohesion is the attraction between the liquid molecules themselves.
Step 6: In capillary action, adhesion is stronger than cohesion, which allows the liquid to climb up the solid surface.

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