Surface tension has the dimension of force per unit length, or of energy per unit area. The two are equivalent, but when referring to energy per unit of area, it is common to use the term surface energy, which is a more general term in the sense that it applies also to solids.
What is the relationship between surface tension and temperature?
The strength of surface tension depends on intermolecular forces. As temperature increases, molecules of liquid become more active and they move more rapidly; therefore, the intermolecular forces are more instable. Surface tension decreases with increasing temperature.
What is the relation between surface tension and work done?
If we increase the free surface area of a liquid then work has to be done against the force of surface tension. This work done is stored in liquid stu-face as potential energy, This additional potential energy per unit area of free surface of liquid is called surface energy.
What is surface tension equal to?
Surface tension is defined as, The ratio of the surface force F to the length L along which the force acts. Mathematically, surface tension can be expressed as follows: T=F/L.
What is surface tension prove that surface energy is numerically equal to surface tension?
A film is formed which pulls the wire AB inwards due to surface tension with a force, We have included a factor of 2 because the soap film has two free surfaces. Hence surface energy is numerically equivalent to its surface tension.
What are dimensions of surface tension and surface energy?
Or, T = [M1 L1 T-2] × [L-1] = M1 T-2. Therefore, surface tension is dimensionally represented as M1 T-2.
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.
Does surface tension increase or decrease with temperature?
As temperature decreases, surface tension increases. Conversely, as surface tension decreases strong; as molecules become more active with an increase in temperature becoming zero at its boiling point and vanishing at critical temperature.
Why is surface tension inversely proportional to temperature?
In general, surface tension decreases when temperature increases because cohesive forces decrease with an increase of molecular thermal activity. The influence of the surrounding environment is due to the adhesive action of liquid molecules that they have at the interface.
What is surface energy derive an expression to measure surface energy of a liquid?
The additional energy associated with the surface of liquids is known as surface energy S.E- (surface tension) (increase in the area) ie, S.E =T(A2-A1)
What is the relation between surface tension and angle of contact?
Surface tension causes an increase in cohesive forces. So when the temperature rises, surface tension decreases and the angle of contact increases.
How do you increase surface tension?
To increase the surface tension of water, you’d have to add something to water, in which case, it would no longer be pure water. By adding something more polar than water to water, the surface tension would increase (just as doing the opposite decreases surface tension).
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