**Surface Tension** is a measure of a liquid’s tendency to **minimize its surface area.** Dimensions of surface tension can be derived from its definition.

It can be defined as the **force acting per unit length** *on a line drawn tangential to the surface.*

It is a common property of liquids and has many daily-life applications.

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## Units of Surface Tension

As we can see, Surface Tension is defined as **force per unit length**. Thus, its units must be “**Newtons per meter**” in *SI units*. In *CGS units*, its units must be “**dyne per cm**”.

## Dimensions of Surface Tension

We can derive the** dimension of surface tension** from its units.

We know the **dimensions of force** are \([\mathbf{M L T}^{-2}]\).

Similarly, the **dimensions of length** are \([\mathbf{M}^0 \mathbf{ L }^1 \mathbf{T}^0]\).

Thus, noting that **Surface Tension = Force/Length**, we get,

Dimensions of surface tension = \(\frac{[\mathbf{M L T}^{-2}]}{[\mathbf{M}^0 \mathbf{ L }^1 \mathbf{T}^0]} = [\mathbf{M} \mathbf{ L }^0 \mathbf{T}^{-2}]\)

Thus, **dimension of surface tension are** \([\mathbf{M} \mathbf{ L }^0 \mathbf{T}^{-2}]\).

## FAQs

**What are the dimensions of surface tension?**The **dimensions of surface tension** are \([\mathbf{M} \mathbf{ L }^0 \mathbf{T}^{-2}]\)

**What is surface tension?**Surface tension is a property of a liquid. It measures how much a liquid tends to **resist external forces**. It is also a measure of how much the liquid tries to** minimize its surface area.**

**Give some daily life examples of surface tension.**Some daily-life examples of surface tension are:

1. **Blowing bubbles** takes work, due to surface tension of soap water.

2. A **pin can float on water**, supported by surface tension.

3. Water and other liquids can **soak paper due to capillary action of fibres**. This happens due to surface tension.

4. **Bubbles and drops** are **round** in shape because surface tension forces them to minimize surface area.

**What is the cause of surface tension?**Surface tension is caused due to *interaction of liquid molecules at the *** surface of liquid**. The

**attraction**they experience towards the

*interior*is experienced as surface tension.