In weight per unit length or length per unit weight the fiber

**Fineness**can be expressed. According to Textile Institute the**fineness**of cotton, silk and manufactured fibers are usually expressed in term of average linear density. Every single fiber has variable cross-section along its length. And every single fiber can be varies in cross-section shape from fiber to fiber.
Mass = volume × density

=Cross-sectional area× length × density

For a known length or unit length, Mass is proportional to cross-section.

To measuring a known length of fiber by using this formula is called

**linear density**and this expressed in weight per unit length.**Importance of Fineness**:

1. Lower irregularity of yarn.

2. Uniformity of count.

3. Uniformity of strength.

4. Less twist.

5. Good appearance.

6. Less neps.

Fineness is one of the vital characteristic of a textile fiber. Fineness will help to get high quality yarn.

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