Final answer:
The amount of pressure applied during haircutting when combing or holding a subsection of hair is known as tension. It is crucial for achieving consistent haircut lengths.
Step-by-step explanation:
In haircutting, the amount of pressure applied when combing or holding a subsection during a haircut is referred to as tension. Tension relates to the force applied along the length of a section of hair being held; it's analogous to the stretching force along a flexible connector like a rope or tendon. When hairstylists apply tension, they are effectively stretching the hair to a desired tightness to achieve consistent haircut lengths and outcomes.