Surface Tension

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Surface tension is defined as force per unit length acting at right angles on either side of an imaginary line in the liquid surface. Formula: T = F/l Here, T = surface tension, F = force, l = length …

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Given: F = 0.24 N l = 0.12 m Formula: T = F/l Solution: T = 0.24 N / 0.12 m T = 2.0 N/m Answer: 2.0 N/m Check: Unit = N/m, which is correct.

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A surface molecule experiences an unbalanced inward pull because molecules inside the liquid attract it from all sides, while molecules outside the surface are absent. As a result, the surface tends t…

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Relation: W = T × ΔA and T = W/ΔA Here, W = work done, ΔA = increase in surface area. Meaning: Surface tension is equal to the work required to increase the surface area of a liquid film by unity at c…

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Given: ΔA = 0.50 m² T = 0.040 N/m Formula: W = T × ΔA Solution: W = 0.040 N/m × 0.50 m² W = 0.020 N·m W = 0.020 J Answer: 0.020 J…

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SI unit: N/m Dimensional formula: [MT^-2] Surface tension can also be expressed in J/m^2 because it is work done per unit area increase.

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Liquid drops and bubbles are spherical because a sphere has minimum surface area for a given volume. This helps the liquid surface attain minimum energy. Small mercury drops are spherical for the same…

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Given: R = 0.002 m T = 0.030 N/m Formula: p = 2T/R Solution: p = (2 × 0.030 N/m) / 0.002 m p = 0.060 / 0.002 N/m² p = 30 N/m² p = 30 Pa Answer: 30 Pa…