How does the soap clean the dirt?
The structure of the soap molecules allows them to remove dirt easily. They are formed by a chain of hydrocarbons, with a sodium or potassium atom at the end.The end of the hydrocarbon chain is attracted to grease and rejects water, while the other end attracts water.
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When you wash your hands, the greasy dirt particles are surrounded by soap molecules, and the ends of the hydrocarbon chain that are attracted to the water are facing outwards.
This breaks down the dirt, which is washed away by the water. Once after bathing we have asked ourselves: how much sebum do we lose when we wash our bodies?
Sebum is a mixture of oils and waxes that exudes our skin to lubricate its surface and to limit the growth of bacteria.
This does not require a large amount: even the most fatty areas of the body such as the head, produces about 0.03 mgr of sebum per square centimeter of skin per hour (in an adult individual). If you are a teenager with acne, this amount can be three times higher.
One person, on average, has a skin area of about 1.8 square meters. If we assume that the body produces about half the tallow produced by the head, that means that the total production is 6,500 mgr in a 24-hour period.
Depending on how hot the shower water is and how vigorously we scrub with the sponge, one loses about half. That is, about 3 grams. In the case of adolescents, they can lose between 9 and 10 grams.