化学势是热力学与统计物理中重要的物理量，能够表征系统中粒子转移的趋势.本文以钨材料表面氢平衡浓度这一实际问题为例，在氢平衡浓度计算过程中逐步引入化学势的概念，通过分析环境氢分子系统和钨表面系统中氢化学势的变化，给出不同温度、压强下钨表面的氢平衡浓度.在热力学与统计物理教学中，通过平衡浓度的计算促进学生对于化学势等概念的学习和深入理解

As an important physical quantity in Thermodynamics and Statistical Physics，chemical potential describes the trend of particle transition in thermodynamic systems.Here，by taking the case of“equilibrium concentration of hydrogen on tungsten surface”as an example，we introduce the concept of the chemical potential to determine equilibrium concentration.Careful analyses on the variation of the chemical potential for hdyrogen in both the molecular hydrogen system and tungsten surface system explicitly illustrate the equilibrium concentration of hydrogen on tungsten surface under different temperatures and pressures.Such equilibrium concentration calculation greatly benefits the understanding of the physical origin of chemical potential concept in Thermodynamics and Statistical Physics.