Author: Physics Notebook
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Obtain The Relation Between The Vapour Pressure Over A Curved Liquid Surface And That Over A Flat Surface.
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Let us consider, a capillary tube is vertically dipped in a liquid. The surface tension of the liquid is T and the density of the liquid is . Now the whole arrangement is enclosed in an exhausted bell jar. The liquid evaporates, when the space within the bell jar is saturated then the equilibrium is…
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Why Is A Small Drop Of Liquid Spherical In Shape?
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Due to the cohesive forces between the molecules of a liquid, the free surface of a liquid drop always tries to contract to the smallest possible area. As a result the liquid assumes a spherical shape because for a given volume, a sphere has the minimum surface area. When a liquid drop is placed on…
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What Is The Shape Of A liquid Drop On A Horizontal Plate?
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When a liquid drop is placed on a horizontal plate, there are two forces acting on that drop of the liquid, the force due to surface tension, the force due to gravity. The force due to gravity tends to flatten the liquid drop and spread it out until its surface becomes horizontal. On the other…
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What Is The Shape Of A Liquid Meniscus In A Capillary Tube?
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When a capillary tube is partly dipped inside a liquid vertically, then there will be ascent or descent of the liquid inside the capillary tube. In case of a liquid which wets the glass plate, as in case of water, alcohol, etc, when the glass plate is dipped vertically inside that liquid then the level…
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What Is Jurin’s Law?
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Jurin’s Law: The liquid in a capillary tube rises to a maximum height h from the outer level of the liquid, given by [Read In Detail] where, is the radius of the capillary tube, is the density of the liquid, is the acceleration due to gravity, is angle of contact. If the capillary tube is…
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What Will Happen If The Length Of The Capillary Tube Is Smaller Than ‘h’?
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Length of the tube smaller than ‘h’: The liquid in a capillary tube rises to a maximum height h, given by [ Read In Detail ] where, r is the radius of the capillary tube, is the density of the liquid, is the angle of contact between the liquid and the tube, g is the…
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Explain Clearly From Where The Energy Comes When The Liquid Rises Against The Gravity In The Capillary Tube.
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Energy required to raise a liquid inside a capillary tube: When a capillary tube is partly dipped inside a liquid which wets the tube, then the liquid inside the tube rises up over the liquid surface outside the tube and its potential energy increases. Now the question is from where the liquid gets this increased…
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Derive An Expression For The Height Through Which A Liquid Of Surface Tension T Will Rise In A Capillary Tube Of Radius r.
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Rise of a liquid in a capillary tube: Let us consider a capillary tube of radius r is dipped in a liquid vertically. The liquid within the tube rises until it stands at certain a height. The surface column at the top inside the capillary tube is hemispherical and concave upwards. Let be the height…
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What Is Capillarity? What Is Capillary Curve?
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Capillarity: Capillarity is defined as the phenomenon of ascent or descent of a liquid or elevation or depression of a liquid inside a capillary tube from the level of liquid outside the tube, when the tube is vertically and partially dipped inside the liquid. Let us consider, a capillary glass tube is dipped in a…
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Show With The Help Of Diagrams How A Liquid Surface Meets A Solid When The Angle Of Contact Is (i) Smaller Than 90 Degree, (ii) Greater Than 90 Degree.
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To find whether the angle of contact between a solid and a liquid is obtuse or acute, let us consider the case of a solid, liquid and air in contact. Let θ be the angle of contact and be the surface tension of the air-liquid interface, be the surface tension of the air-solid interface and be the surface tension…