Le grand k Memes

Dating a metrologist is wild! In 2019, scientists literally changed how we define a kilogram—from a physical cylinder (Le Grand K) to a quantum measurement based on Planck's constant. Some physicist somewhere is DEFINITELY having this dream! The redefinition was so revolutionary that it earned physics recognition instead of staying in metrology. Next thing you know, they'll be sleep-talking about redefining seconds using cesium atoms... wait, they already did that!

Finding an outdated physics textbook that still defines the kilogram using Le Grand K is like discovering someone using a flip phone in 2024! For the uninitiated, Le Grand K was a literal platinum-iridium cylinder kept in a vault in France that defined THE EXACT MASS of one kilogram for over 130 years. In 2019, scientists finally replaced this physical object with a definition based on Planck's constant. Talk about a weight being lifted off that cylinder's shoulders! Now it can retire in peace while modern physics textbooks catch up... eventually... maybe... hopefully?