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As at May 2019, what officially defines a kilogram?

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As at May 2019, what officially defines a kilogram?
posted Jan 28 by Manish Tiwari

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Fixed numerical value of Planck's Constant defining a Joule second, together with a metre and second
The platinum alloy block has served as the standard in one form or the other since 1799, the water definition being the standard before then. However, the platinum artefact changes over time. With increasing refinement of measuring capacity Planck's Constant is now able to be fixed and serves as an unvarying definition and one widely available.

answer Jan 29 by Sandeep Bedi
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