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Completely liquid assets, like cash, may even fall victim to inflation, the gradual decrease in purchasing power over time. In general, the more liquid an asset is, the less its value will increase over time. But it’s important to recognize that liquidity and holding liquid assets comes at a cost. Liquidity is important because owning liquid assets allows you to pay for basic living expenses and handle emergencies when they arise. Cash in a bank account or credit union account can be accessed quickly and easily, via a bank transfer or an ATM withdrawal. And cash is generally considered the most liquid asset. The easier it is to convert an asset into cash, the more liquid it is. But liquid will never flow.Liquidity describes your ability to exchange an asset for cash. Smaller the value of h, greater will be the value of R. Smaller the diameter of capillary tube, greater is the rise of liquid in it.Īs, T, ρ and g are all constant, Rh = Constant This signifies, height of liquid risen (or depressed) in a capillary tube varies inversely as the radius of tube. If weight of meniscus is taken into account, the force of surface tension will be,įor fine capillary, force of surface tension, T = rhρg/2 cos θ Weight of liquid, W = Vρg = π r 2 ρg (Here r is the radius meniscus) ? Capillarity is the phenomenon, by virtue of which the level of liquid in a capillary tube is different from that outside it, is called capillarity. (iii) Such liquid is put in the solid tube it will have meniscus concave upwards.
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(ii) Liquid molecules will stick with the solid, thus making solid wet. (i) Force of cohesion between two molecules of liquid is less than the force of adhesion between molecules of solid and liquid. (e) Δ E = 4π R 2 T ( n 1/3-1) = 4π R 3 T (1/ r – 1/ R)Īngle of contact:-Angle of contact, for a pair of solid and liquid, is defined as the angle between tangent to the liquid surface drawn at the point of contact and the solid surface inside the liquid.
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(b) Bubble:- The surface area of the surface films of a bubble of radius R is, A = 2×4π R 2Ĭombination of n drops into one big drop:. (a) Drop:- Area of surface film of a spherical drop of radius R is given by, A = 4π R 2 (b) Expansion under adiabatic conditions:-įorce of surface tension is numerically equal to the surface energy under adiabatic conditions. To supply energy for maintaining the temperature of the film:. W= T× A (Here A is the total increase in surface area) To do work against forces of surface tension:. (a) Expansion under isothermal condition:.
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Potential energy per unit area of the surface is called surface energy. (c) For a ring:- F = T×2×2π r (Here r is the radius of cylindrical rod) (b) For a rectangular block:- F = T×2( l+ d) (Here l is the length and d is the thickness of the rectangular block) (a) For a cylindrical rod:- F = T×2π r (Here r is the radius of cylindrical rod) (b) T = Surface energy/Surface area = W/ A It is measured in terms of force of surface tension.įorce of surface tension:- It is defined as the amount of force acting per unit length on either side of an imaginary line drawn over the liquid surface.
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Surface tension is the property of a liquid by virtue of which its free surface behaves like a stretched membrane and supports, comparatively heavier objects placed over it. Surface film:- Surface film of a liquid is defined as the portion of liquid lying on the surface and caught between two parallel planes situated molecular range apart. Sphere of influence:- Sphere of influence of any molecule is the sphere with molecule as its center and having a radius equal to molecular range (=10 -7 cm). Molecular range:- The maximum distance between two molecules so that the force of attraction between them remains effective is called molecular range. Concepts of Physics by HC Verma for JEEįorce of cohesion:-It is force between two molecules of similar nature.įorce of adhesion:- It is the force between two molecules of different nature.IIT JEE Coaching For Foundation Classes.