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将煤的表面用非极性溶液不同程度地覆盖，以测定低煤阶煤的Ｚ电位。用Ｚ电位来确定液体的膜压，使其可以用来计算煤表面自由能的非极性列夫赛特－范德华力γＷｓ（Ｌｉｆｓｈｉｔｚ－ｗａｎｄｅｒＷａａｌｓ）。通过测量水和甘油与煤的接触角可确定表面自由能中的电子供体γ－ｓ和电子受体γ＋ｓ，并将γ－ｓ和γ＋ｓ与非色散力γｎｓ进行比较。从表面自由能各组分的数值证实，随煤化程度增加，煤的憎水性增加。通过在哈利蒙德（Ｈａｌｉｍｏｎｄ）单气泡管中对不同类型煤的自然可浮选性试验进一步证实了这一观点。
The surface of the coal was covered with varying degrees of nonpolar solution to determine the Z potential of the low rank coal. The zeta potential is used to determine the membrane pressure of the liquid so that it can be used to calculate the non-polar Lifshitz-wanderWaals of coal surface free energy. The electron donor γ-s and the electron acceptor γ + s in the surface free energy were determined by measuring the contact angles of water and glycerol with coal, and the γ-s and γ + s were compared with the non-dispersive γns. From the surface free energy of the various components of the value confirmed that with the degree of coalification increased coal hydrophobicity increased. This is further confirmed by the natural flotation test of different types of coal in a single bubble tube in Halimond.