Surface tension object targeted

[quangtu123]

To what I know, surface tension is a force that appear at the interface between 2 bulk phases, and is parallel to that interface.

Let consider a bulk of a fluid in the air. In the bulk of a fluid at rest, two sub-parts of a fluid exert a attractive force on one another due to surface tension.

What I'm asking is that: Do two sub-parts of the air around exert a force on one another? (surface tension of the air) If they do, is the force equal the force in the fluid? If they don't, why? What if I replace the air by another suitable fluid?

 

[dauto]

In general the molecules in a gas are too far from each other in order to produce non-negligible forces on each other except during very brief collisions. That's the main difference between a liquid and a gas.

 

[quangtu123]

Ok so what would happen if I put a fluid inside some other fluid?