**Question 44 (Textile Technology & Fibre Science)**

If the density of 100% crystalline polyethylene is 1000 kgm^{-3} and that of 100% amorphous polyethylene is 865 kgm^{-3}, then the mass fractional crystallinity of a polyethylene fibre with density 970 kgm^{-3}, accurate to two decimal places, is __**0.79 to 0.81**__.

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**Given in the question**–

Density of **crystalline** region()=**1000kg.m ^{-3}**

Density of

**amorphous**region()=

**865kg.m**

^{-3}Polyethylene fibre density()=

**970kg.m**

^{-3}Mass fraction crystallinity of the polyethylene fibre()=

**?**

**Formula**–

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**Answer)**