Have you ever heard that a Perfect Kilogram is an object stored 60 feet below the ground of National Institute of Standards and Technology (NIST), USA.
This is used as a physical prototype to create the Weight measuring standard instruments in the USA.
Recent research has been found that the weight of this object is decreasing overtime. Scientists are trying to find the reason behind this.
Find more detailed information on this at: The Search for More Perfect Kilogram
Source: www.wired.com
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