# Nootan Solutions Surface Tension ISC Class-11 Physics Nageen Prakashan

Nootan Solutions Surface Tension ISC Class-11 Physics Nageen Prakashan Chapter-16 Numericals of latest edition. Step by step Solutions of Kumar and Mittal ISC Physics Part-2 Class-11 Nageen Prakashan Numericals Questions. Visit official Website CISCE for detail information about ISC Board Class-11 Physics.

## Nootan Solutions Surface Tension ISC Class-11 Physics Nageen Prakashan

 Class: 11 Subject: Physics Part-2 Chapter 16            Surface Tension
 Board ISC Writer / Publications Nootan / Nageen Prakashan / Kumar and Mittal Topics Solved Numericals of page 658,659

### Nootan Solutions Surface Tension ISC Class-11 Physics Nageen Prakashan

#### Surface Tension :

According to the definition of surface tension, it is the phenomenon that occurs when the surface of a liquid is in contact with another phase (it can be a liquid as well). Liquids tend to acquire the least surface area possible. The surface of the liquid behaves like an elastic sheet.

Surface tension not only depends upon the forces of attraction between the particles within the given liquid but also on the forces of attraction of solid, liquid or gas in contact with it. The energy responsible for the phenomenon of surface tension may be thought of as approximately equivalent to the work or energy required to remove the surface layer of molecules in a unit area.

Surface tension is typically measured in dynes/cm, the force in dynes is required to break a film of length 1 cm.

Given below in a table is the surface tension of various liquids:

 Liquid Surface Tension (N/m) Hydrogen 2.4 Helium 0.16 Water 72.7 Ethanol 22.0 Sodium Chloride 114

Surface tension definition :-

lets us know that the surface tension mainly depends upon the forces of attraction between the particles within the given liquid and also upon the gas, solid, or liquid in contact with it.

#### Dimension of Surface Tension :-

As we know, surface tension is given by the formula,

Surface tension = F/L

We know that F = ma, substituting the value in the equation, we get

=ma/L

Equating the fundamental quantities into the equation, we get

=MLT-2L-1

Solving further, we get

=MT-2

Hence, the dimensional formula of surface tension is MT-2.

#### Examples of Surface Tension :-

Water striders, which are small insects, can walk on water as their weight is considerably less to penetrate the water surface. Like this, there are various examples of surface tension which are found in nature. Some cases are provided below:

• Insects walking on water
• Surface tension disinfectants (disinfectants are solutions of low surface tension).
• Cleaning of clothes by soaps and detergents which lowers the surface tension of the water
• Washing with cold water
• Round bubbles where the surface tension of water provides the wall tension for the formation of water bubbles.
• This phenomenon is also responsible for the shape of liquid droplets.
• Floating a needle on the surface of the water.
• Rainproof  tent materials where the surface tension of water will bridge the pores in the tent material
• Clinical test for jaundice

### Nootan Solutions Surface Tension ISC Class-11 Physics Nageen Prakashan

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