抄録
Degree of coalification and petrographic component have long been considered as the genetic properties governing the processing of coal. However, another genetic property, or degree of reduction, has come into use in USSR in fundamental and applied researches. Because of its potential importance in utilization of coal including coke making, a review of the Soviet studies is made with emphasis on the genetic meaning of the degree of reduction, the relation between degree of reduction and chemical structure of coal, the parameters to describe the degree of reduction and examples of applications of the degree of reduction.
