Abstract
Review and digest of the preceeding literatures were made in order to demonstrate a physico-chemical aspect of coals.Appearent density, porosity and specific surface area were considered at a stand point of the way of constructing the coal matrix. True density, reflectance and hardness were regarded, in a connection with their ultimate composition, as functions reflecting the chemical structure of coal molecule. Thermo-plasticity were discussed with solvent-extraction experiments and with chemical constitution for a general understanding of the caking property of coal.Chemical reactions such as oxidation, pyrolysis, hydrogenolysis and depolymerization were outlined and specific behaviours of various coals of different ranks were discussed.
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