Current Science

Open Access Open Access  Restricted Access Subscription Access

National Physical Laboratory Demonstrates 1 G Kibble Balance:Linkage of Macroscopic Mass to Planck Constant


Affiliations
1 CSIR-National Physical Laboratory, New Delhi 110 012, India
2 Amity University, Gurugram 122 413, India
 

Mass is the only base unit, which is represented as a primary standard in the form of artifact for more than 125 years. International prototype of kilogram (IPK) is kept at the Bureau International des Poids et Mesures (BIPM), Paris and serves as the international standard of kilogram. It is made of 90% platinum and 10% iridium and as a cylinder of 39 mm diameter and 39 mm height. Replicas of the IPK are made of the same material and used at BIPM as reference or working standards and national prototype of kilogram (NPK), kept at different National Metrology Institutes (NMIs). NPK-57, kept at CSIR-National Physical Laboratory, is sent periodically to BIPM for calibration.
User
Notifications
Font Size

  • Davis, R., Metrologia, 2003, 40, 299–305.

  • Stock, M., Barat, P., Davis, R. S., Picard, A. and Milton, M. J. T., Metrologia, 2015, 52, 310–336.

  • Kibble, B. P. and Robinson, I. A., Feasibility study for a moving coil apparatus to relate the electrical and mechanical SI units. Technical Report DES 40, NPL, 1977.

  • Kibble, B. P., Robinson, I. A. and Belliss, J. H., Metrologia, 1990, 27, 173–192.

  • Haddad, D. et al., Rev. Sci. Instrum., 2016, 87, 061301.


Abstract Views: 278

PDF Views: 80




  • National Physical Laboratory Demonstrates 1 G Kibble Balance:Linkage of Macroscopic Mass to Planck Constant

Abstract Views: 278  |  PDF Views: 80

Authors

Anil Kumar
CSIR-National Physical Laboratory, New Delhi 110 012, India
Harish Kumar
CSIR-National Physical Laboratory, New Delhi 110 012, India
V. N. Ojha
CSIR-National Physical Laboratory, New Delhi 110 012, India
Shakti Singh
Amity University, Gurugram 122 413, India
Girija Moona
CSIR-National Physical Laboratory, New Delhi 110 012, India
Satish
CSIR-National Physical Laboratory, New Delhi 110 012, India
P. K. Dubey
CSIR-National Physical Laboratory, New Delhi 110 012, India
H. K. Singh
CSIR-National Physical Laboratory, New Delhi 110 012, India
Goutam Mandal
CSIR-National Physical Laboratory, New Delhi 110 012, India
D. K. Aswal
CSIR-National Physical Laboratory, New Delhi 110 012, India

Abstract


Mass is the only base unit, which is represented as a primary standard in the form of artifact for more than 125 years. International prototype of kilogram (IPK) is kept at the Bureau International des Poids et Mesures (BIPM), Paris and serves as the international standard of kilogram. It is made of 90% platinum and 10% iridium and as a cylinder of 39 mm diameter and 39 mm height. Replicas of the IPK are made of the same material and used at BIPM as reference or working standards and national prototype of kilogram (NPK), kept at different National Metrology Institutes (NMIs). NPK-57, kept at CSIR-National Physical Laboratory, is sent periodically to BIPM for calibration.

References





DOI: https://doi.org/10.18520/cs%2Fv113%2Fi03%2F381-382