Surface Tension vs. Interfacial Tension

Difference Between Surface Tension and Interfacial Tension

The tension of surface and interfacial tension are effects based on liquids. These two effects take place because of intermolecular force which destabilized the liquid molecules or resolutions. We notice these effects in daily life in the form of numerous events such as, forming droplets, immiscibility of liquids, capillary action, soap bubbles, and tears of wine and even the shorts of the spider of water. These two measurements play a major role in our daily activities without knowing us even that they exist. For an example, you would not be able of blending a mixture of emulsion, if it is not for these theories.

The tension of surface

Let us consider a liquid, which is homogeneous. Every molecule in the central parties of liquid has exactly the same quantity of force by pulling in every side. The ambient molecules draw the central molecule uniformly at all directions. Now, let us consider a molecule of surface. It has only force acting on her towards liquid. Air force sticks the liquid but not evenly as liquidating force of cohesion. So, the molecules of surface are attracted towards the centre of the liquid, creating a coat of molecules of packing. This coat of surface of molecules acts as a slim film on liquid. If we take the concrete example of the spider of water, it uses this fine thin coating to be situated on the surface of water. It slides on this coat. If it is not for this coat, it would have immediately drowned. Superficial tension is defined as parallel force in the perpendicular surface in a line of unit length drawn on the surface. Units of tension of surface are Nm-1. Superficial tension is also defined as energy by unit of surface. It also gives units of the tension of new surface Jm-2.

Interfacial tension

Interfacial tension is only defined for not miscible liquids. As this name points it out it applies to the interface of both not miscible liquids. The same theory applies of superficial tension too. The only difference between interfacial tension and tension of surface is liquid – liquid Interface instead of liquid – Interface of air. Interfacial tension can be used to represent immiscibility of these two liquids. Let us consider interface between liquids. Molecules in the surface face the first force acting on it from the first liquid and from the molecules of second surface of liquid and vice versa. If the force on the molecules of surface of the first liquid (force of cohesion) is equal to the force of the second surface (force of membership), these two liquids blend. If this force is unequal this liquids do not blend.

Difference between superficial tension and interfacial tension

Main difference enters this is places where it occurs. Superficial tension is defined for the single liquid surface, while interfacial tension is defined in the interface of two not miscible liquids. The tension of surface is in fact a derivation of interfacial tension where the force of the second surface is negligible or any.

 

 

 

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