If $\bar{M}_w$ is the weight average molecular weight and $\bar{M}_n$ is the number average molecular weight of a polymer,the poly dispersity index $(PDI)$ of the polymer is given by
- A$\frac{\bar{M}_n}{\bar{M}_w}$
- B$\frac{\bar{M}_w}{\bar{M}_n}$
- C$\bar{M}_w \times \bar{M}_n$
- D$\frac{1}{\bar{M}_w \times \bar{M}_n}$
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