The cohesive forces between molecules down into a liquid are shared with all neighboring atoms. Decrease in water surface tension with heating Water at 20☌ has a surface tension of 72.8 dynes/cm compared to 22.3 for ethyl alcohol and 465 for mercury. Equivalently, it can be stated as surface energy in ergs per square centimeter.
Surface tension is typically measured in dynes/cm, the force in dynes required to break a film of length 1 cm. This forms a surface "film" which makes it more difficult to move an object through the surface than to move it when it is completely submersed.
The molecules at the surface do not have other like molecules on all sides of them and consequently they cohere more strongly to those directly associated with them on the surface. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.
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