What is a kilogram?

Before reading this, I knew how the length of a metre was set but I did not know how the original kilogram was set.  The members of the  International Bureau of Weights and Measures are to vote on Friday whether to set the weight of a kilogram to be defined by the Planck constant.  The method of setting the weight of a kilogram needs to be looked at as the piece of platinum-iridium, despite being kept carefully does not always weigh the same, as it still manages to attract dust and dirt even within 3 bell jars.

Source: Scientists to swap dusty old kilogram for something more stable

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