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Chapter 12: Q12.59P (page 496)

Why are units of energy per area (J/m2) used for surface tension values?

Short Answer

Expert verified

Surface tension is the force experienced by the surface molecules of the liquid. The quantity is dependent on the number of molecules present on the surface; thus, the units of surface tension is (N/m-1) i.e., Force per unit meter or energy (Fm-1) per unit area.

Step by step solution

01

Surface Tension

The surface tension is the force experienced by the liquid surface molecules because of the unbalanced forcesof attraction on the surface.

02

Unit of Surface Tension

As the surface tension is the force experienced by the molecules, its unit should be Newton /meter. In other words, as Energy is the force applied per unit meter, the surface tension is the energy per unit square meter i.e., (J/m2).

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