When you half-fill a glass with water, the water creeps up...

Name: Problem 19, Chapter 12: Physics: A Conceptual World View
Uploaded: 2020-06-13T02:49:00-08:00
Duration: 40 s
Channel: Mayukh Banik
Description: When you half-fill a glass with water, the water creeps up where it meets the glass. What can you conclude about the relative strengths of the inter molecular forces between the water molecules and the adhesive forces between the water molecules and the glass?

When you half-fill a glass with water, the water creeps up where it meets the glass. What can you conclude about the relative strengths of the inter molecular forces between the water molecules and the adhesive forces between the water molecules and the glass?

Key Concepts

Intermolecular Forces

Intermolecular forces are the attractive forces that exist between molecules. In water, these forces include hydrogen bonding, van der Waals forces, and dipole interactions. These forces are crucial for understanding properties like cohesion and surface tension and influence how water behaves in various situations.

Cohesion

Cohesion refers to the attractive forces between like molecules, such as the hydrogen bonds between water molecules. This attraction helps maintain the integrity of the liquid, leading to phenomena like surface tension, where water tends to minimize its surface area due to the mutual pull among molecules.

Adhesion

Adhesion describes the attractive force between unlike substances, such as water molecules and the glass surface of a container. When adhesive forces are stronger than cohesive forces, water tends to spread along the surface of the glass, resulting in phenomena like the water rising along the sides of the glass.

Capillary Action

Capillary action is the process by which liquid moves through narrow spaces, often against gravity, as a result of the interplay between cohesive and adhesive forces. In the case of water in a glass, the adhesive forces between water and the glass overcome the cohesive forces between water molecules, causing the water to 'creep' up the surface along the glass walls.

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