|Expressed in:||1 kg =|
The kilogram or kilogramme[Note 1] is a
There are attempts to define the kilogram in other ways. One example specifies a number of
One kilogram is a little more than 2.2
In 1879, the piece of metal was made. It was officially chosen to be the kilogram in 1889. It was made of 90% platinum and 10% iridium. Those metals were chosen because they do not
The original kilogram is kept inside bell jars. Over time, dust can collect on it. Before it is measured, it is cleaned to get the original size.