Click here to find more about history of soap making from prehistory days Figure. It is missing half its attractive interactions, which is why when segregated to the surface, a liquid molecule is in an unfavorable energy state.
Soaps and detergents have been known to mankind for quite a long time now.
The earliest known evidence of soap use are Babylonian clay cylinders dating from 2800 BC containing a soap-like substance.
A formula for soap consisting of water, alkali and cassia oil was written on a Babylonian clay tablet around 2200 BC.
The Ebers papyrus (Egypt, 1550 BC) indicates that ancient Egyptians bathed regularly and combined animal and vegetable oils with alkaline salts to create a soap-like substance.
A soap factory with bars of scented soap was found in the ruins of Pompeii (79 AD).
Legend has it that soap gets its name from Mount Sapo where ancient Romans sacrificed animals.
Rain would send a mix of animal tallow and wood ash down the mountain and into the clay soil on the banks of the Tiber.
Eventually, women noticed that it was easier to clean clothes with this "soap".
(this phenomena has in fact implications for textile fibers, process known as 'oiling') -After stepping out of shower, one dries off by way of evaporation (which can make one feel cold) and by dewetting (the process by which dry areas form spontaneously and expand on one's skin0 - If you ever noticed water drops stuck to windshield, you would know that while large droplets roll down the glass, smallest drops remain stuck.