Question

what is effect of impurities and temperature on surface tension​

Answer 1

Answer:

The presence of impurities on the surface of, or dissolved in, a substance directly affects the surface tension of the liquid. The surface tension of water, for example, will increase when highly soluble impurities are added to it.

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Answer 2

Answer:

$\underline{\bf{Temperature}}$ - Surface tension decreases when temperature increases

$\underline{\bf{Impurities}}$ - If the impurities tend to concentrate on the surface of the liquid instead of bulk then they lower the surface tension