在高中物理中有几处提到“无穷远”,如:物体在离地球无穷远时,其重力势能为零;两个点电荷之间的距离为无穷远时相互作用力为零,电势能为零;从无穷远射来的光束可以看作平行光;氢原子的核外电子由基态跃迁到无穷远时要吸收13．6eV的能量; There are several places in high school physics that refer to “infinity”, such as: when the object is at infinity from the earth, its gravitational potential energy is zero; when the distance between two point charges is infinity, the interaction force is zero, and the potential energy is It is zero; the light beam emitted from infinity can be regarded as parallel light; the extranuclear electron of hydrogen atom absorbs 13.6eV of energy from the ground state transition to infinity;