**Relation between Two Fineness Measuring Systems**

**Rana Sohel**

Executive Engineer

Sunman Textile Mills Ltd. Chittagong

**Cell:**+8801912-420118

**Email:**rsohel07tex@gmail.com

**System of measuring fineness:**

The fineness of

**cotton**fiber is measured by following two systems:

**American system :**

In this system the linear density is expressed in microgram per inch.

Here, the unit of weight = microgram (gm X 10-6)

The unit of length = inch

Here, the unit of weight = microgram (gm X 10-6)

The unit of length = inch

**British system:**
In this system the linear density is either the fiber wt, per cm or the hair wt per cm, H

Here, the unit of weight = milligram X 10-5

The unit of length = cm

The unit of fineness = H X 10-5 mg/cm

= A X 10-6 gm/inch

= Fiber wt in gm X 10-3 X 10-5/cm

= H X 10-8 gm/cm

= H X 10-8 X 2.54 gm/inch

We have, A X 10-6 = H X 10-8 X 2.54

This is the derived relationship between them.

Here, the unit of weight = milligram X 10-5

The unit of length = cm

The unit of fineness = H X 10-5 mg/cm

**Relation between Two Fineness Measuring Systems****American linear density**= Fiber wt in gm X 10-6/inch= A X 10-6 gm/inch

**British linear density**= Fiber wt in mg X 10-5/cm= Fiber wt in gm X 10-3 X 10-5/cm

= H X 10-8 gm/cm

= H X 10-8 X 2.54 gm/inch

We have, A X 10-6 = H X 10-8 X 2.54

**=> A = H X 10-2 X 2.54**This is the derived relationship between them.