An inertial mass measurement prototype at NIM

The absolute measurement of the mass, as well as the determination of the Planck constant, has become one of the most important issues in metrology toward a new kilogram definition based on fundamental constant. A method for measuring the inertial mass, being different from the gravitational mass measurement by either a watt balance or the Avogadro project has been carried out recently at National Institute of Metrology (NIM). In this summary, the inertial mass measurement project is introduced.