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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