Why the world is finally retiring the physical object defining our mass
For over two centuries, our global standard for mass has relied on a single physical artifact. This video explains the shift toward a new, more precise measurement system driven by an ingenious device called the watt balance.
Since the 1800s, humanity has anchored its definition of mass to a physical object. This reliance on a tangible artifact for global calibration is set to end within the next few years as metrology transitions to a system based on fundamental physical constants.
The watt balance serves as the key technology enabling this transition. By measuring mass through electrical power, this device allows scientists to define the kilogram with unprecedented stability, moving away from the vulnerabilities inherent in maintaining a physical standard.
