NIST in 90: What Is Planck's Constant? (video) National Institute of Standards and Technology (NIST) Share Print E-Mail Loading video... Caption In this 'NIST in 90' video, NIST physicist Darine Haddad uses a cup of coffee and sugar cubes to explain the significance of Planck's constant. Credit NIST Usage Restrictions May be used with credit to NIST. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.