Search the dictionary A Chinese word or character, or English Search 2 entries. pǔlǎngkèchángshù 普朗克常数 Planck's constant h, approximately 6.626 x 10⁻³⁴ joule.seconds pǔlǎngkèchángshù 普朗克常數 Planck's constant h, approximately 6.626 x 10⁻³⁴ joule.seconds