molecular diffusion - effect that produces band-broadening expressed by the second term of the van Deemter equation; the effect is due to the sample diffusion in the mobile phase.

See analyte diffusion.

molecular weight distribution - the distribution of molecular weight of molecules in a polymer sample. Distribution can be defined as weight average and number average.

monomeric phase - refers to a bonded phase in which single molecules are bonded to the silica surface. For silica gel, monomeric phases are prepared by the reaction of an alkyl or arylmonochlorosilane. Polymeric phases are generally prepared from a di- or tri-chlorosilane reactant and form a tree-like structure.

See polymeric and monomeric bonding.