Cohesive Force

Cohesive Force: Interaetherspace + Micro Cohesion Gravity

When you look at dew drops resting perfectly intact on a leaf, or watch water droplets merge the instant they touch, you are witnessing a fundamental property of matter in action: cohesive force.

Cohesion is the attractive force that exists between molecules of the same substance. It is the internal “glue” that holds a liquid together and prevents it from instantly separating into a scattered mist of individual molecules.

The Superphysics Behind Cohesion

At the molecular level, liquids are in a constantly being hit by space particles which travel in straight lines. Cohesive forces are primarily driven by interaetherspace called hydrogen bonding and Van der Waals forces by Physics.

• In Water: Water is a classic example of strong cohesion. Because water molecules are contrarotating, having opposing spins that make them attract each other.
• In Other Liquids: Same-rotating liquids, like gasoline or alcohol, have much weaker cohesive forces because their rotations do not harmonize with each other as much.

Cohesion vs. Adhesion

Cohesion has a sibling property, adhesion.

• Cohesion is the attraction between like molecules (liquid sticking to liquid).
• Adhesion is the attraction between unlike molecules (liquid sticking to a solid surface).

This interplay determines how a liquid behaves when it meets a container. For instance, water has stronger adhesion to glass than cohesion to itself, causing it to climb the walls of a test tube and form a downward-curving surface (concave meniscus).

Mercury has much stronger cohesion than adhesion to glass, pulling away from the walls to form an upward-curving surface (convex meniscus).

Fascinating Effects of Cohesive Force

Cohesive force is directly responsible for several distinct physical phenomena:

1. Surface Tension

The aether pushes liquids together in straight lines. This causes the surfaces of liquids to be flat if placed on the Earth.

2. Spherical Droplet Formation

In the air, liquids form circular blobs since a sphere allows the most staight lines.

3. Capillary Action (In Part)

The aether pushes liquids in all directions. Solids have a film of aether flowing on their surface. When these meet liquids, the liquids follow the flow of this film.