They've been trying to redefine it for a while.
Here's the article I read a few years ago about it losing mass, these guys want to redefine it as a set number of carbon-12 atoms: http://www.sciencedaily.com/releases/2007/09/070921110735.htm
Here they want to use Planck's number: http://www.npr.org/templates/story/story.php?storyId=112003322
So we've got three different ideas on how to change the measure, I have a feeling they'll be arguing over it for a lot longer and different groups will adopt one measure or another.
They've been trying to redefine it for a while.
Here's the article I read a few years ago about it losing mass, these guys want to redefine it as a set number of carbon-12 atoms: http://www.sciencedaily.com/releases/2007/09/070921110735.htm
Here they want to use Planck's number: http://www.npr.org/templates/story/story.php?storyId=112003322
So we've got three different ideas on how to change the measure, I have a feeling they'll be arguing over it for a lot longer and different groups will adopt one measure or another.