For Good Measure

Big Picture Science

Science, Technology

4.5 • 1K Ratings

🗓️ 9 September 2019

⏱️ 54 minutes

🔗️ Recording | iTunes | RSS

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Summary

The reign of Le Grand K has come to an end. After 130 years, this hunk of metal sitting in a Parisian vault will no longer define the kilogram. The new kilogram mass will be defined by Planck’s constant, joining three other units for redefinition by fundamental constants. But as we measure with increasing precision – from cesium atomic clocks to gravitational wave detectors able to measure spacetime distortions to 1/1000th the width of a proton – is something fundamental lost along the way? Meanwhile, the BiPiSci team accepts the banana-measurement challenge. Guests: 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 Wolfgang Ketterle – Physicist at MIT, Nobel Laureate Simon Winchester – Author of “The Perfectionists: How Precision Engineers Created the Modern World” Learn more about your ad choices. Visit megaphone.fm/adchoices

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1:03.0	It's official.
1:05.0	It's official.
1:11.0	It's official.
1:12.0	The kilogram has changed. I mean it's still a kilogram but it now has more
1:17.1	kilogramness. The reason goes back to around the time the first stage of the Eiffel Tower
1:22.0	was completed when a hunk of metal was placed in a Parisian
1:25.5	vault to define the kilograms mass. It was the kilogram and has been ever since. But having a man-made physical object
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