ABSTRACT
In reactions between a solid and a fluid phase, it is important to note the amount of solidphase changes during the reaction. If all reaction products are gases, the solid phase shrinks during the reaction. The reacting solid particle decreases in size, even when the differences in densities between the solid reactant and the solid product are large: tensions in the product layer around the solid particle are developed, and the product layer is continuously peeled away from the surface of the reactant.
