Why are droplets of mercury when brought in contact pulled together to form s bigger drop ? Also state with reasons whether the temperature of this bigger drop will be the same , or more , or less than the temperature of the smaller drop ?

Dear student,

The cohesive forces among the liquid molecules are responsible for this phenomenon of surface tension. In the bulk of the liquid, each molecule is pulled equally in every direction by neighboring liquid molecules, resulting in a net force of zero. The molecules at the surface do not have other molecules on all sides of them and therefore are pulled inwards. This creates some internal pressure and forces liquid surfaces to contract to the minimal area.

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