Abnormal nitrogen adsorption on coal is observed, in which coal is a kind of nonrigid sorbent and swelling/shrinkage of coal matrix occur with abnormal nitrogen adsorption/desorption.

• 液氮法实验结果表明煤对液氮的吸附量具有异常现象，该异常现象是由于煤为非刚性吸附剂，即煤吸附和解吸液氮后可引起煤基质膨胀和收缩。