普朗克常数
普朗克常数记为 h，是一个物理常数，用以描述量子大小。拉量子力学中占有重要个角色，马克斯·普朗克拉1900年研究物体热辐射个规律时发现，只有假定电磁波个发射搭吸收弗是连续的，而是一份一份地进行个，计算个结果才能搭实验结果相符。
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