Explanation
When a liquid is sprayed, the surface area of the liquid increases. Therefore, work has to be done in spraying the liquid, which is directly proportional to the surface tension.
Because on adding soap, surface tension of water decreases, the spraying of water becomes easy.
The soap solution has less surface tension as compared to ordinary water and its surface tension decreases further on heating. The hot soap solution can, therefore spread over large surface area and also it has more wetting power. It is on account of this property that hot soap solution can penetrate and clean the clothes better than the ordinary water.
Surface tension decreases with increase in temperature.
Surface tension pulls the plates towards each other.
Needle floats due to surface tension there is no role of
buoyant force in its floating
Buoyant force = Vσg
Where V = Volume of body submerged in liquid. σ = Density of liquid.
1. e., the buoyancy of an object depends on the shape of he object.
The two glass plates stick together due to surface tension.
The presence of impurities either on the liquid surface or dissolved in it, considerably affect the force of surface tension, depending upon the degree of contamination. A highly soluble substance like sodium chloride when dissolved in water increase the surface tension. But the sparing soluble or substance like phenol when dissolved in water reduces the surface tension of water.
With increase in temperature surface tension of the liquid decreases and angle of contact also decreases.
We know that the intermolecular distance between the gas molecules is large as compared to that of liquid. Due to it the forces of cohesion in the gas molecules are very small and these are quite large for liquids. Therefore, the concept of surface tension is applicable to liquid but not to gases.
The free surface of liquid tries to acquire a minimum area due to surface tension, hence liquid drop is spherical because sphere has minimum area than other shape.
When a drop of liquid is poured on a glass plate, the shape of the drop also is governed the force of gravity. For very small drops, the potential energy due to gravity is insignificant compared to that due to surface tension. Hence, in this case the shape of the drop is determined by surface tension alone and drop becomes spherical.
Because if the length available is less than required, then water will rise upto available height and adjust its radius of curvature.
Soap helps to lower the surface tension of solution, thus soap get stick to the dust particles and grease and these are removed by action of water.
Surface tension of water decrease with rise in temperature.
When two droplets merge with each other, their surface energy decreases.
W = T(ΔA) = (negative) i.e., energy is released.
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