The drop that makes a glass overflows
If you fill a glass until the top and the last section we do drop to drop, we reach a point where a drop enters the glass begins to overflow. We can consider that the penultimate drop completed volume of the glass and last drop did not fit and so it fell by the side. So just get out there would expect a drop, but in reality much more water overflows. This behavior is caused by the surface tension of the liquid that links the surface preventing it from breaking, thus the last drops before overflow don't fit but tension doesn't let water to fall by side. When it starts to overflow? So when the weight of the liquid is higher than the tension, the surface loses its mechanical consistency and breaks, it let out all the excess liquid. There are other metastable situations that after passing the threshold of stability, under certain conditions so close to threshold, it remains stable until they were disturbed or too move away to threshold. The instantaneous vaporization of water’s gl...