**Dimensional Formula of Surface Tension**

**Dimensional Formula of Surface Tension**

**with its Derivation**

In this article, we will find the dimension of Surface Tension

Dimensional formula for Surface tension is

Where

M -> Mass

L-> Length

T -> Time.

We would now derive this dimensional formula.

## Derivation for expression of Dimension of Surface Tension

Surface tension is a force per unit length (or surface energy per unit area) acting in the plane of the interface between the plane of the liquid and any other substance.It is denoted by Letter S.Now as per definition

$S = \frac {F}{L}$ –(1)

Where

S-> Surface Tension

F -> Force

L-> Length

Now dimension of Length is given by $[T]$

Lets derive the dimension of Force

Force is defined as product of Mass and acceleration

$F= m \times a$

Dimension of Mass is given by $[M]$

Dimension of Acceleration is derived as

$a= \frac {dv}{dt}$

Where v = velocity, t= time

Lets derive the dimension of Velocity

$v= \frac {dx}{dt}$

or

$v = \frac {d}{t}$

Now

Where

d-> displacement

t -> Time

Now Dimension of Displacement = $[L^1]$

Therefore, dimension of Velocity= $\frac {[L^1]}{[T^1]}=[M^0 L^1T^{-1}]$

So Dimension of Acceleration is given by

$\text{Dimension of Acceleration} =\frac {\text{dimension of velocity}}{\text {dimension of time}}$

$\text{Dimension of Acceleration} =\frac { [M^0 L^1T^{-1}] }{[T]}= [M^0L^1T^{-2}]$

Hence Dimension of Force will be

$ \text{Dimension of Force} = [M^1 ] \times [ M^0L^1T^{-2}] = [M^1L^1T^{-2}]$

Now from equation (1) , we can determine the dimension of Surface Tension as

$ \text{Dimension of Surface Tension} = \frac {\text{Dimension of force}}{ \text{Dimension of Length}} $

$=\frac { [M^1L^1T^{-2}] }{[L]}=[ M^1L^0T^{-2}] $

Unit of Surface Tension is N/m

Try the free Quiz given below to check your knowledge of Dimension Analysis:-

**Quiz on Dimensional Analysis**

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