The prototype of one kilogram (NPK-57) is already available in India and placed at National Physical Laboratory, New Delhi as per the provisions made under the Legal Metrology (National Standards) Rules, 2011.
There is no such proposal at present before the Government to achieve the new prototype of kilogram through physical constants.
The previous definition of kilogram was based on the mass of the international prototype ‘kilogram’ which is an artefact, however, the new definition is based on physical constants of nature.
The change is in the definition of kilogram and will not have any practical implications.
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