我们平常所用的肥皂,是用油脂和碱做成的。油脂和碱在一起就会变成硬质酸钠盐。这种盐有个怪脾气,常常一部分落在水里(亲水),一部分溶在油里(亲油)。脏衣服上一般都沾着些灰尘、煤烟、油污和汗水等。当它们遇上肥皂时,就会被肥皂包围起来。此时,只要你将衣服搓一搓,肥皂中的发泡剂就会发挥作用,产生许多泡沫,这些泡沫把衣服 The soap we normally use is made of grease and alkali. Together, fat and base turn into sodium salt of sodium stearate. This salt has a strange temper, often part of the water (hydrophilic), some dissolved in oil (lipophilic). Dirty clothes are generally stained with dust, soot, oil and sweat. When they meet the soap, it will be surrounded by soap. At this point, as long as you rub your clothes, soap in the foaming agent will play a role, resulting in a lot of foam, the foam of the clothes