Give two practical illustrations of surface tension.
(N/A) Surface tension is a property of liquids where the surface acts like a stretched elastic membrane. Two practical illustrations are:
$1$. Raindrops are spherical: Due to surface tension,the surface area of a liquid drop tends to be minimum for a given volume. For a given volume,a sphere has the minimum surface area,hence raindrops are spherical.
$2$. Cleaning action of detergents: Detergents reduce the surface tension of water,allowing it to penetrate into the pores of fabrics and effectively remove dirt and grease.
$1$. Raindrops are spherical: Due to surface tension,the surface area of a liquid drop tends to be minimum for a given volume. For a given volume,a sphere has the minimum surface area,hence raindrops are spherical.
$2$. Cleaning action of detergents: Detergents reduce the surface tension of water,allowing it to penetrate into the pores of fabrics and effectively remove dirt and grease.
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$A$ metal sheet $4 \ m$ on a side and of negligible thickness is attached to a balance and inserted into a container of fluid. The balance to which the metal sheet is attached reads $0.50 \ N$ and the contact angle is found to be $0^{\circ}$. $A$ small amount of oil is then spread over the metal sheet. The contact angle now becomes $180^{\circ}$ and the balance now reads $0.49 \ N$. The surface tension of the fluid is:
Is surface tension a vector or scalar? Explain.
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View SolutionConsider a water tank shown in the figure. It has one wall at $x=L$ and can be taken to be very wide in the $z$ direction. When filled with a liquid of surface tension $S$ and density $\rho$,the liquid surface makes an angle $\theta_0 \left(\theta_0 \ll 1\right)$ with the $x$-axis at $x=L$. If $y(x)$ is the height of the surface,then the equation for $y(x)$ is:
(Take $\theta(x) \approx \sin \theta(x) \approx \tan \theta(x) = \frac{dy}{dx}$,where $g$ is the acceleration due to gravity.)
(Take $\theta(x) \approx \sin \theta(x) \approx \tan \theta(x) = \frac{dy}{dx}$,where $g$ is the acceleration due to gravity.)
DifficultNEET 2025
View SolutionWrite two units of surface tension and give the dimensional formula of surface tension.
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View Solution$n$ number of liquid drops each of radius $r$ coalesce to form a single drop of radius $R$. The energy released in the process is converted into the kinetic energy of the big drop so formed. The speed of the big drop is [$T = \text{surface tension of liquid}, \rho = \text{density of liquid}$.]
DifficultMHT CET 2023
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