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It will be interesting to see if this goes ahead: Kilogram set to be redefined, heralding a new era of measurement
Since 1889, one kilogram has been defined as the mass of a platinum and iridium cylinder. The idea being that both metals are resistant to corrosion, so the mass doesn't change over time. But apparently there has been some variation between copies - a few micrograms.
So this definition of the kilogram could change to be tied to Planck's constant - depending on the result of a vote.
Since 1889, one kilogram has been defined as the mass of a platinum and iridium cylinder. The idea being that both metals are resistant to corrosion, so the mass doesn't change over time. But apparently there has been some variation between copies - a few micrograms.
So this definition of the kilogram could change to be tied to Planck's constant - depending on the result of a vote.