Effects of sample mass on the kinetics of isothermal dehydration of crushed crystals of Li2SO4·H2O were investigated using conventional TG. The process was characterized by a combination of Avrami-Erofeyev and contracting
geometry models. Distribution of the fractional reaction, α, in particles within the sample assembly as well as the change
in the rate of gross diffusion of the evolved water vapour appear responsible for the sample-mass-dependent kinetic parameters
obtained for the system.