In some of the descriptions I have found about surface tension, while they explain the phenomenon for liquid in an open container they use the following arguments:
1) A molecule at the surface feels a net downward force
2) A molecule which is not at the surface feels zero net force
As far as I know, even in static fluid, the molecules are always in motion and it is not logical to think any of them with zero acceleration and with zero net force.
Are those explanations correct or not?