National Institute of Standards and Technology | Measuring Planck’s Constant @NIST | Uploaded June 2016 | Updated October 2024, 14 hours ago.
In this 2016 video, NIST physicist Darine Haddad uses a cup of coffee and sugar cubes to explain the significance of Planck’s constant. In 2017, after this video was recorded, NIST measured an even more accurate value of the Planck constant, 6.626069934 x 10−34 kg∙m2/s, with an uncertainty of only 13 parts per billion. This measurement contributed to the now-accepted value of 6.62607015 kg∙m2/s in the revised International System of Units (SI) approved in November 2018
In this 2016 video, NIST physicist Darine Haddad uses a cup of coffee and sugar cubes to explain the significance of Planck’s constant. In 2017, after this video was recorded, NIST measured an even more accurate value of the Planck constant, 6.626069934 x 10−34 kg∙m2/s, with an uncertainty of only 13 parts per billion. This measurement contributed to the now-accepted value of 6.62607015 kg∙m2/s in the revised International System of Units (SI) approved in November 2018
