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Chapter 34 Long-lasting soap, detergency decreases
Humidity in the environment can cause soap hydrolysis, and too dry climate will make the soap dry and crack, forming "salty", that is, "white frost" on the surface of the soap, which will reduce the detergency and durability of the soap.

In addition, the soap solution should not be too thick.

Soap can reduce the surface tension of water, so that the soaked clothes are soaked quickly, and the dirt on the clothes becomes small particles and falls off, decomposes in the water and floats on the water surface, and the clothes are clean.

The optimal concentration of soap in water is 0.2% to 0.5%, at this time the surface activity is the strongest and the detergency is the best.Above or below this concentration, the surface activity decreases and the detergency is weakened.

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Do not wash your lower body with soap, because soap will irritate the urethra and vaginal mucosa, and cause pain, and will reduce the ability of the vagina to resist bacterial invasion, making it easier for bacteria to enter the body, causing urinary tract infections, vaginitis and other diseases.

(End of this chapter)