What term refers to the weak physical side bonds in hair?

The term that refers to the weak physical side bonds in hair is hydrogen bonds.

Hydrogen bonds play a crucial role in the overall structure and characteristics of hair. They are formed by the attraction between the hydrogen atom of one molecule and the oxygen atom of another, creating weak links that can be easily broken and reformed. This is particularly relevant during processes like shampooing, conditioning, and styling, where moisture can temporarily break these bonds, allowing the hair to change shape.

Understanding the nature of hydrogen bonds is important for hair care professionals, as they can significantly influence the hair’s flexibility and texture. In contrast, the other types of bonds mentioned, such as covalent and disulfide bonds, are much stronger and play a different role in the structure of hair, contributing to its overall strength and durability. Salt bonds, while also weak, are different in their chemical nature and don’t primarily refer to the common physical side bonds affecting hair's everyday care.