RELATIONS

RELATION BETWEEN THE ML INCREASED AND SURFACE TENSION:

Firstly, we have to know what surface tension is, so:

The cohesive forces (the intermolecular forces between molecules) between liquid molecules are responsible for surface tension. The molecules at the surface do not have other molecules on all sides of them and consequently they stick more strongly to those directly associated with them on the surface. This forms a surface "film or tension" which makes it more difficult to move an object through the surface.

Also, is caused due to force applied to the molecule, which push the molecules to the surface, and because they are not receiving any force at the surface, the molecules have more resistance.

An example: Imagine a door is the molecule of water, and you the intermolecular force. If you push the door, you are adding resistance to the door, so is going to be harder to open the door from the other side if you are pushing it to remain it close because you are adding a force.

Example image:

Once we know what surface tension, we can explain the relation between the ml increased (capillary action) and surface tension.

The relation between them is joined by: adhesives forces. We have cohesive and adhesive forces. As I said before cohesive forces are the one between the molecules of water and cause surface tension and adhesive forces are the ones that cause the capillary action. This adhesive forces are attractions between unlike molecules, for example molecules from water and glass molecules, and this forces are stronger than the cohesive forces, so the glass molecules act like a vacuum and water is suckled upwards and because of the cohesive forces in the water, all lo the liquid moves up due to surface tension and not only the edges of the meniscus formed.

Image example:

RELATION BETWEEN THE INTERMOLECULAR FORCES AND SURFACE TENSION    

In base everything I explained before, referring to cohesive forces, which are the intermolecular forces between the molecules, we can determine the relation of them with surface tension, which is: when more stronger is the intermolecular force, more strength is going to have the surface tension, so we can say that they have a directly proportional relation, when one of the variables increases at strength, the other too.