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This happens at the critical point, where the line between liquid and gas in a phase diagram terminates. There are then self-similar density fluctuations at all length scales, which leads to critical opalescence. The surface becomes infinitely large, or one could indeed also say that there is no surface anymore.


Surface tension is ultimately a property of liquids that stems from their cohesion, or the attractive forces between molecules of that liquid. Take water, for instance. A partially positive hydrogen atom in one molecule of water may temporarily bond to a partially negative oxygen atom in another, leading to a substantial cohesive force. Cohesion and surface ...

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