Surface tension object targeted

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Surface tension is a force that occurs at the interface between two bulk phases, acting parallel to that interface. In a fluid at rest, sub-parts of the fluid attract each other due to surface tension. However, in gases like air, the distance between molecules is too great for significant attractive forces to occur, resulting in negligible surface tension. If a fluid is placed inside another fluid, the interactions depend on the properties of both fluids, including their densities and viscosities. Understanding these dynamics is crucial for applications involving multiple fluid phases.
quangtu123
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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?
 
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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.
 
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Ok so what would happen if I put a fluid inside some other fluid?
 

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