- #1
exponent137
- 564
- 34
Planck constant in
http://pdg.lbl.gov/2015/reviews/rpp2015-rev-phys-constants.pdf
determined to 12 ppb.
Planck constant in
https://www.sciencedaily.com/releases/2016/06/160621115645.htm
was measured with 34 ppb and it is a big step forward in replacing of Paris kilogram with more stable definition. They predict still a better measurement with this device.
A similar measurement was with watt balance was also made in Canada a few years ago and it was precisier. A do not find link now.
How it is possible that PDG have value 12 ppb, but value 34 ppb is good anyway? I suppose that value 12 ppb is measured also by watt ballance?
What is connection among these values?
http://pdg.lbl.gov/2015/reviews/rpp2015-rev-phys-constants.pdf
determined to 12 ppb.
Planck constant in
https://www.sciencedaily.com/releases/2016/06/160621115645.htm
was measured with 34 ppb and it is a big step forward in replacing of Paris kilogram with more stable definition. They predict still a better measurement with this device.
A similar measurement was with watt balance was also made in Canada a few years ago and it was precisier. A do not find link now.
How it is possible that PDG have value 12 ppb, but value 34 ppb is good anyway? I suppose that value 12 ppb is measured also by watt ballance?
What is connection among these values?