00:02
Okay, this is chapter 11, section problem 52, and it asks us when a thin glass tube is put into water, the water rises 1 .4 centimeter.
00:10
When the same tube is put into hexane, the hexane rises only 0 .4 centimeters, explained.
00:16
So i've kind of just drawn this really easy to understand the example anyway, but if we put a tube that has very thin, a thin diameter, the inner diameter of the inner diameter of the tube into water, the capillary action is what draws the water molecules through that tube.
00:39
And capillary action is described by your textbook really is a combination of two forces primarily that act against gravity.
00:47
The first is the cohesive forces of the liquid molecules to interact with each other.
00:52
And the other force at hand is adhesive force, which describe the interactions between the liquid solvent molecules and the surface of the tube.
01:02
So the reason why water will rise further in a given tube than hexanes is because of an increase in the adhesive forces.
01:13
So the water molecules are more strongly interacting with the sides of this tube and are being pulled up the sides of the tube.
01:25
And this can happen because like if glass is like silicon dioxide or something like that, right? like the water molecules can kind of interact with the sides of these tubes...