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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.


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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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