00:03
So here we're investigating whether liquid is able to wet the glass.
00:08
And whether liquid is able to wet the glass or not will depend on the strength of the intermolecular forces, which we've identified as cohesive forces, compared with its ability to interact with the glass itself.
00:20
So when are attractive forces, so af, between the glass tube and the liquid, are stronger than the liquid's intermolecular forces, which are the cohesive forces, then the liquid will come into contact with the capillary tube, and so we will wet the tube.
00:50
And so what we form is a concave meniscus within the capillary tube.
00:55
So water, for example, will wet the tube considerably well if the glass is made of silica, where silica is s -i -o -2...