The persistent, though transient, attraction between molecules is what gives a liquid its surface tension and allows it to maintain cohesion as it flows. In a gas, the kinetic energy is so high that it completely overcomes these attractions, allowing molecules to move independently.
What Makes Liquid Flow Resistance
This phenomenon generates surface tension, an elastic "skin" that allows the liquid to resist external force. The balance between intermolecular forces and thermal kinetic energy dictates the transition.
A liquid occupies the middle ground: the kinetic energy is sufficient for molecules to break free from their immediate neighbors and move randomly, but it is not enough to escape the bulk substance entirely. This behavior distinguishes it from solids, which resist deformation, and gases, which expand to occupy all available space.
What Makes Liquid Flow Resistance: The Role of Intermolecular Forces and Surface Tension
Compressibility and Density: The Nearly Incompressible State. The Dynamic Surface: Surface Tension and Capillarity Molecules within the bulk of a liquid experience attractive forces from all directions, resulting in a net force of zero.
More About What makes a liquid a liquid
Looking at What makes a liquid a liquid from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on What makes a liquid a liquid can make the topic easier to follow by connecting earlier points with a few simple takeaways.
