Redefining the Kilogram
“REDEFINITION OF THE KILOGRAM
TABLE OF CONTENT
Contents
1.0 LITERATURE REVIEW
It is only the Kilogram in the International System (SI) that is defined by a monument: the International kilogram prototype (IPK). The feasible changes in International prototype Kilogram (IPK) may result in imbalances in international system (SI) unit as some other units in the SI depend on the kilogram for their definition and therefore, a distinct definition of the kilogram became a necessity on the agenda of the International metrology.
A meaningful attempt is been proposed to redefine the kilogram centred on basic constants, and a major agreement presently thrives to define the kilogram in relation to the Planck Constant “h”. To accomplish this redefinition, a consistent realization of the kilogram centred on several analysis is necessary. At the moment, measurement of the Planck Constant based on the Silicon Sphere Avogadro and Watt balance approaches have been concluded, but there exists certain disagreements in the results which mar the achievement within limit of allowable uncertainty of “2 X 10-8”.The Proposed Joint Report Project need to improve on these analysis with the objective of resolving the disagreements in results of the various experiments, hence, allowing the redefinition of the Kilogram.
1.1 BACKGROUND TO THE METROLOGICAL CHALLENGES
Currently, the Kilogram is the only International System of Units (SI) been defined on a monument. Way back 1889, mass metrology had depended on the International Prototype of the Kilogram (IPK) which is defined as mass of absolutely 1kg. Large changes in the International Prototype Kilogram (IPK) and both the official and national prototypes exist, over the past 120 years, this drift is found to be as much as 50µg.
A meaningful international work is been proposed to redefine the kilogram centred on basic constants, it’s now
TABLE OF CONTENT
Contents
1.0 LITERATURE REVIEW
It is only the Kilogram in the International System (SI) that is defined by a monument: the International kilogram prototype (IPK). The feasible changes in International prototype Kilogram (IPK) may result in imbalances in international system (SI) unit as some other units in the SI depend on the kilogram for their definition and therefore, a distinct definition of the kilogram became a necessity on the agenda of the International metrology.
A meaningful attempt is been proposed to redefine the kilogram centred on basic constants, and a major agreement presently thrives to define the kilogram in relation to the Planck Constant “h”. To accomplish this redefinition, a consistent realization of the kilogram centred on several analysis is necessary. At the moment, measurement of the Planck Constant based on the Silicon Sphere Avogadro and Watt balance approaches have been concluded, but there exists certain disagreements in the results which mar the achievement within limit of allowable uncertainty of “2 X 10-8”.The Proposed Joint Report Project need to improve on these analysis with the objective of resolving the disagreements in results of the various experiments, hence, allowing the redefinition of the Kilogram.
1.1 BACKGROUND TO THE METROLOGICAL CHALLENGES
Currently, the Kilogram is the only International System of Units (SI) been defined on a monument. Way back 1889, mass metrology had depended on the International Prototype of the Kilogram (IPK) which is defined as mass of absolutely 1kg. Large changes in the International Prototype Kilogram (IPK) and both the official and national prototypes exist, over the past 120 years, this drift is found to be as much as 50µg.
A meaningful international work is been proposed to redefine the kilogram centred on basic constants, it’s now