Dne 11/16/2014 v 1:18 AM Solving Tornadoes napsal(a):
> .......... it is also reflected
> in the surface tension (the residual electromagnetic energy)
> that is produced by H2O molecules. In liquid water this surface
> tension is very slight, almost nonexistent. In the gaseous phase
> of water, steam, the surface tension emitted by each H2O molecule is high.
Why to learn what is surface tension, if you can just guess ?
Why to learn anything at all, if all can be just guessed ?
I do not expect anything but offences from ST,
what is common behaviour of people without clue.
Surface tension is related to change of Gibbs energy of system,
related to change of area of liquid phase border.
It is caused by non zero net force,
acting on molecules of liquid phase at boundary level,
as one hemisphere of surrounding molecules is missing.
As result, smaller the droplet, easier is for single molecule
to escape then from flat surface.
This is also a cause, why droplets of ALL liquids have higher tension of
compared to flat liquid surface at the same conditions.
As their escape is partially powered by decrease of surface.
Surface tension has no physical sense for single molecules.
Surface tension can be expressed as energy per area,
or force per length. Liquid water has about 70 mN /m,
resp. 70 mJ / sq m,
what is several time more than for majority of other liquids.