A problem associated with the surface potential jump at the air-water interface has been studied for many years. However, to date, there is no consensus both as to its value and sign. This is due to the impossibility of direct measurement of the surface potential, which caused that many scientists have attempted to estimate the value and sign of this potential, indirectly by measuring other physical parameters or using simulation methods. In this review, the most important results concerning this issue were collected and briefly described.
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