What is the primary cause of surface tension in liquids?

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Question: What is the primary cause of surface tension in liquids?

Options:

Correct Answer: Cohesive forces

Solution:

Surface tension is primarily caused by cohesive forces between liquid molecules, which create a \'skin\' at the surface.

What is the primary cause of surface tension in liquids?

What is the primary cause of surface tension in liquids?

Correct Answer: Cohesive forces between liquid molecules

Step 1: Understand that liquids are made up of tiny particles called molecules.
Step 2: Know that these molecules are attracted to each other. This attraction is called cohesive forces.
Step 3: Realize that molecules in the middle of the liquid are surrounded by other molecules, so they are pulled equally in all directions.
Step 4: Notice that molecules at the surface do not have other molecules above them, so they are pulled more strongly towards the liquid below.
Step 5: This unequal pulling creates a 'skin' or tension at the surface of the liquid, which we call surface tension.

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