> Unless the new definition was based on the current IPK and set its mass as of today as the standard, and that standard now will be unchanging? Correct. The c

> Unless the new definition was based on the current IPK and set its mass as of today as the standard, and that standard now will be unchanging? Correct. The current IPK will still be 1kg to within margin of error at the time the new definition comes into effect, but any further changes to it will make it, for the first time, drift away from that value.