00:01
Is asking about surface tension and how it is affected by temperature.
00:04
So when we are talking about surface tension, surface tension, we are saying this is a measure of the inward intermolecular forces of attraction that must be overcome to expand the surface area.
00:22
So it is a measure of force and the force that we are talking about here are the intermolecular forces.
00:36
Of attraction.
00:40
These are the intermolecular forces of attraction, the forces that hold substances together.
00:46
So we're talking about the force that is required to overcome these forces and expand, expand the surface area of the liquid.
01:08
Say you've got a liquid, for example, water molecules that are inside a container.
01:18
What happens with molecules is that they always want to bond together.
01:24
They are always attracted to each other because of the hydrogen bonds.
01:28
Let's just put it like this here.
01:31
There are hydrogen bonds that always want to bring these molecules together.
01:38
So on the surface here, on the surface of the container, we've got few water molecules.
01:47
Remember, compared to a fully submerged water molecule.
01:53
That is interacting with all these other molecules, h2o molecules.
01:58
But here on the surface, we've got h2o molecules.
02:02
There is fewer h2o molecules because right here we've just got an open atmosphere...