Question

Why is surface tension positive?

Answer 1

And where energy is found, forces are not far away. Molecules sitting at a free liquid surface against vacuum or gas have weaker binding than molecules in the bulk. The missing (negative) binding energy can therefore be viewed as a positiveenergy added to the surface itself.

Answer 2

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✔️✔️this would imply that the system could lower its free energy by increasing its surface area.

Molecules sitting at a free liquid surface against vacuum or gas have weaker binding than molecules in the bulk.

The missing (negative) binding energy can therefore be viewed as a positiveenergy added to the surface itself.

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