What is surface tension definition Class 11?

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Surface tension is the property of any liquid by virtue of which tries to minimize its free surface area. Surface tension of a liquid is measured as the force acting per length on an imaginary line drawn tangentially on the free surface the liquid. Surface tension S = Force/Length = F/l = Work done/Change in area.

What is a surface tension in physics?

surface tension, property of a liquid surface displayed by its acting as if it were a stretched elastic membrane. This phenomenon can be observed in the nearly spherical shape of small drops of liquids and of soap bubbles. Because of this property, certain insects can stand on the surface of water.

What is surface tension in 12th physics?

Surface tension is defined as force per unit length acting perpendicular to the tangential line on the surface. It is due to imbalanced attractive forces acting downwards and tends to reduce the surface area of a liquid to minimum.

What is surface tension and it’s unit?

Surface tension, represented by the symbol γ (alternatively σ or T), is measured in force per unit length. Its SI unit is newton per meter but the cgs unit of dyne per centimeter is also used.

What is surface tension give an example?

1. A Drop of Liquid. Whether walking through the rain, spilling the morning coffee, or putting an eye drop, we come across several liquids splashing off the solid surfaces.

What is cohesion and surface tension?

Surface tension is a property of liquids, which arises due to the cohesion forces between identical liquid molecules. Cohesion can be described as the aggregation of similar molecules due to the intermolecular attraction forces between them.

Who discovered surface tension?

Phil chose Agnes Pockels, a self-trained chemist who discovered so much about surface tension.

What is the SI unit of surface energy?

The SI unit of Surface Energy is N/m.

What is viscosity and surface tension?

Viscosity is the resistance of a substance to flow (1) and surface tension is a property of liquids such that their surfaces behave like a thin, elastic film (1). Surface tension is created by the inward pulling force exerted on the surface of a fluid (2).

What is surface tension write its formula?

Surface tension is defined as the ratio of surface force F applied to a liquid and the length d over which the force acts. Walking on water is up to the birds, like “floating” a paperclip. The equation is written as: Surface tension = (surface force)/(length force acts) 2.

How is surface tension formed?

The surface tension arises due to cohesive interactions between the molecules in the liquid. At the bulk of the liquid, the molecules have neighboring molecules on each side. Molecules are pulling each other equally in all directions causing a net force of zero.

How is surface tension measured?

Measurement of surface tension can be performed with a force tensiometer. These instruments are based on measuring the forces exerted on a probe that is positioned at the liquid-gas or liquid-liquid interface.

What is surface tension by Vedantu?

Hint:Surface tension is the tendency of the fluid surfaces to shrink into the minimum surface area possible. The surface tension can be determined by the difference of the interactions between the molecules of the fluid with the molecules of the flask or beaker or the molecules of the storage wall.

Why is surface tension important?

Surface tension is an important parameter in many industrial applications including the efficiency of detergent formulation, optimisation of paints, enhanced oil recovery, performance of pharmaceutical compounds and the stability of food products .

What is surface tension and energy?

The attractive force of the molecules present at the surface of a liquid towards each other is called the surface tension of that liquid. Surface energy is the equivalent attractive force present between the molecules at the surface of a solid substance.

What is another word for surface tension?

n. capillary action, interfacial surface tension, capillarity, interfacial tension.

What uses surface tension?

Application of surface tension is also used in the formulation of soaps and detergents. They reduce the water’s surface tension, allowing soaps and detergents to penetrate the pores and holes easily.

What affects surface tension?

Surface tension is caused by the effects of intermolecular forces at the interface. Surface tension depends on the nature of the liquid, the surrounding environment and temperature. Liquids were molecules have large attractive intermolecular forces will have a large surface tension.

What is cohesion and example?

Cohesion means sticking together. If your group of friends heads to the lunchroom as a team and sits all together, you’re demonstrating strong cohesion. Cohesion is a word that comes to us through physics, where cohesion describes particles that are the same and tend to stick together — water molecules, for example.

What is force of cohesion?

cohesion, in physics, the intermolecular attractive force acting between two adjacent portions of a substance, particularly of a solid or liquid. It is this force that holds a piece of matter together. Intermolecular forces act also between two dissimilar substances in contact, a phenomenon called adhesion.

What causes cohesion?

It is caused by the cohesive attractive force between like molecules. Cohesion is an intrinsic property of a molecule, determined by its shape, structure, and electric charge distribution. When cohesive molecules approach each other, the electrical attraction between portions of each molecule holds them together.

Why does surface tension decreases with increasing temperature?

Effect of Temperature on Surface Tension The decrease in surface tension with increase of temperature is due to the fact that with increase of temperature, the kinetic energy of the molecules increases and hence intermolecular attraction decreases.

Why does soap break water surface tension?

In a soap-and-water solution the hydrophobic (greasy) ends of the soap molecule do not want to be in the liquid at all. Those that find their way to the surface squeeze their way between the surface water molecules, pushing their hydrophobic ends out of the water. This separates the water molecules from each other.

How do you find the surface tension of a liquid?

Surface tension is given by the equation S = (ρhga/2) where S is the surface tension, ρ (or rho) is the density of the liquid you are measuring, h is the height the liquid rises in the tube, g is the acceleration due to gravity acting on the liquid (9.8 m/s2) and a is the radius of the capillary tube.

What is the symbol of surface tension?

As a measure of work per unit area or force per wetted length, surface tension has the unit mN/m and is designated by the symbol ;σ (lower case sigma).

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