The IPK is not an ideal standard for the kilogram, because it is subject to wear and tear, and its mass can change over time. In addition, the IPK is very expensive to produce, and it is not easy to transport.
The new definition of the kilogram, which was proposed by scientists from the National Institute of Standards and Technology (NIST) and other institutions, is based on the mass of a specific number of carbon atoms. The number of carbon atoms is chosen so that the new definition is consistent with the current definition, but it is also more precise and easier to reproduce.
The new definition of the kilogram has been approved by the General Conference on Weights and Measures (CGPM), which is the international body responsible for setting standards for weights and measures. The new definition will go into effect on May 20, 2019.
Here are some of the advantages of the new definition of the kilogram:
* It is more precise. The new definition is based on a fundamental constant of nature, which means that it is not subject to change over time.
* It is easier to reproduce. The new definition can be reproduced in any laboratory with the appropriate equipment.
* It is less expensive. The new definition does not require the use of a physical artifact, which makes it less expensive to produce.
The new definition of the kilogram is a major advance in metrology, and it will help to ensure that the kilogram remains a reliable and accurate standard for mass.
