BiPiSci – For Good Measure: Jon Pratt / The Old Kilogram

by Gary Niederhoff on September 9, 2019

BiPiSci – The Old Kilogram
click to listen (TRT 6:16)

Click above to listen to part 2 of For Good Measure, featuring Jon Pratt, Mechanical engineer and engineer and Chief of the Quantum Measurement Division of the Physical Measurement Laboratory (PML) at the National Institute of Standards and Technology (NIST), on the demise of “Le Grand K”, a platinum/iridium cylinder kept in a vault in France (under not one, but two glass cloches), which used to be THE definition of a kilogram. Jon and Molly discuss the drawbacks of having the standard for metric mass represented by a man-made object.

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