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  4. Surface tension of water is T1. When oil spreads on water surface tension becomes T2, the

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Q. Surface tension of water is $T_1$. When oil spreads on water surface tension becomes $T_2$, the

Mechanical Properties of Fluids

Solution:

A highly soluble substance like sodium chloride ordinarily increases the surface tension. But sparingly soluble substances reduce the surface tension. Oil being sparingly soluble reduces the surface tension. i.e.
$T _{2}< T _{1}$ or $T _{1}> T _{2}$