In 2019, the International System of Units (SI) was redefined in terms of constants that relate to the natural world. This assures the future stability of the SI and opens the opportunity for the use of new technologies, including quantum technologies, to implement the new definitions. This ever-improving accuracy needs to be enabled by stable measurement standards underpinned by agreed definitions of measurement units.
Click here for original story, A bench-top Kibble balance to perform ultrasonic power measurements
Source: Phys.org