In our lives, we can't live without soap. Washing soap: bathing medicated soap; laundry taking laundry soap. Today we will discuss how soap washes clothes. First let's take a look at the origin of soap soap.
       According to historical records, the earliest soap formula originated from Mesopotamia in West Asia. Around 3000 BC, one part of oil and 5 parts of alkaline plant ash were mixed to make a detergent. In Europe, there are many legends about the origin of soap. One said that the Gauls in ancient Rome mixed the sheep fat and the mountain-like tree ash solution into a thick shape every time, and applied it to the hair and combed into various hairstyles. Once, the festival suffered heavy rain and the hair was broken. People accidentally found that the hair was clean. It is also said that when the Romans sacrificed their gods, the barbecued beef and sheep oil dripped in the ash, forming a "fat ball." So how do soap wash clothes? When women wash their clothes, they find that clothes that are stained with "fat balls" are easier to wash. This shows that people have used animal fat and grass ash (alkali) raw materials to make soap for thousands of years.
       Archaeologists have discovered soap-making workshops in the ruins of the ancient city of Pompeii in Italy. It shows that the Romans started the original soap production as early as the 2nd century AD. The Chinese also knew very early on how to wash clothes with grass ash and trona. People also mix pig pancreas, lard and trona to form a block called "pancreas."
       The early soap was a luxury, and it was not until 1791 that the French chemist Lubran succeeded in making soots cheaply by electrolyzing salt, thus ending the ancient method of making alkali from the ash. In 1823, the German chemist Cheever discovered the structure and properties of fatty acids. Soap is a kind of fatty acid. At the end of the 19th century, the soap industry was transformed from a handicraft workshop to an industrial production.
       How do soaps wash clothes? What is his decontamination principle? Soap can be decontaminated because it has a special molecular structure, one end of the molecule is hydrophilic, and the other end is lipophilic. At the interface between water and oil, soap emulsifies the oil and dissolves the oil in soapy water; at the interface between water and air, the molecules of soap surrounding the air form a soapy foam. The original water-insoluble dirt, due to the action of soap, can no longer adhere to the surface of the clothes, but dissolves in the soap foam and is finally washed away.
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