An Unknown Physical Constant Missing from Physics

Planck constant is thought to belong to the universal constants among the fundamental physical constants. However, this paper demonstrates that, just like the fine-structure constant α and the Rydberg constant R∞, Planck constant belongs to the micro material constants. This paper also identifies the existence of a constant smaller than Planck constant. This new constant is a physical quantity with dimensions of angular momentum, just like the Planck constant. Furthermore, this paper points out the possibility that an unknown energy level, which cannot be explained with quantum mechanics, exists in the hydrogen atom.