Title: NIST Develops New Kilogram Definition Using Kibble Balance
The National Institute of Standards and Technology (NIST) has successfully developed a new method for defining the kilogram using a device called the Kibble balance. This marks a significant step towards redefining the kilogram in terms of fundamental constants, rather than relying on a physical artifact.
The Kibble balance, also known as the watt balance, measures electrical power to determine mass. By comparing the weight of a test mass to the electrical power required to levitate it, NIST has demonstrated that the kilogram can be precisely defined using the Planck constant, a fundamental constant of nature.
This new approach has the potential to improve the accuracy and stability of mass measurements, which are crucial for many scientific and industrial applications. The Kibble balance method is expected to be adopted as the new definition of the kilogram in the coming years, replacing the current definition based on a physical prototype.
Key technical points:
– The Kibble balance measures electrical power to determine mass
– It compares the weight of a test mass to the electrical power required to levitate it
– The new definition of the kilogram will be based on the Planck constant
– The Kibble balance method is expected to be adopted as the new kilogram definition in the coming years
Source: https://www.nist.gov/si-redefinition/kilogram-kibble-balance
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