What Is Plancks Constant

Plancks constant or the Planck constant is the proportionality constant relating a photons energy to its frequency. The constant is the basis for the definition of the kilogram unit of mass and is important in the field of quantum mechanics.Plancks constant is expressed by the symbol hh 6.62606896(33) x 10-34 JÂ ·sech 4.13566733(10) x 10−15 eVÂ ·sec Because the constants value depends on the units used to describe it, it is known exactly in atomic units, but only out to 12 parts per billion using the metric system. Sources Bowley, R.; SÃ ¡nchez, M. (1999). Introductory Statistical Mechanics (2nd ed.). Oxford: Clarendon Press. ISBN 978-0-19-850576-1Schlamminger, S.; Haddad, D.; Seifert, F.; Chao, L. S.; Newell, D. B.; Liu, R.; Steiner, R. L.; Pratt, J. R. (2014). Determination of the Planck constant using a watt balance with a superconducting magnet system at the National Institute of Standards and Technology. Metrologia. 51 (2): S15. arXiv:1401.8160. doi:10.1088/0026-1394/51/2/S15