Average molecular weight

See Formula

Formula

Amount : {\bar M}_{n}={\frac {\sum n_{x}M_{x}}{\sum n_{x}}}

Weight : {\bar M}_{w}={\frac {\sum n_{x}M_{x}^{2}}{\sum n_{x}M_{x}}} where x is the polymerisation degree, nx the amount of macromolecules in degree of polymerisation and Mx the mass of these macrolecules.