SI unit of surface tension is 

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JKSSB JE Civil Jal Shakti 6 Dec 2022 Official Paper (Shift 1)
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  1. Dynes/cm
  2. Dyne-s/cm2
  3. kN/m2
  4. kN/m3

Answer (Detailed Solution Below)

Option 1 : Dynes/cm
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Detailed Solution

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Explanation:

Surface Tension

It is defined as force per unit length in the plane of the liquid surface at right angles to either side of an imaginary line drawn to the surface.

Mathematically, 

\(\rm Surface\;Tension = \frac{{Force}}{{Length}}\)

  • It is the tendency of the liquid surface to shrink into a minimum surface area.
  • The SI Unit of surface tension is N m-1
  • It allows insects to float and slide on the water surface, usually more dense than water
  • The molecules at the surface have unbalanced force rather than molecules at deeper and the resultant force moves downward this is surface tension.
  • Dimensional formula is MT-2

F1 J.K 19.6.20 Pallavi D5

Note:

In this question, the correct option is given in the CGS unit but the question is asked about the SI unit. So The marked option is the most appropriate.

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