Die Suche nach dem perfekten Kilogramm. Ein spannender Artikel mit großartigen Sätzen wie diesen hier:
Relative to the témoins and to the national standards, Le Grand K has been losing weight — or, by the definition of mass under the metric system, the rest of the universe has been getting fatter.
Leistner spends several months polishing the surface by spinning the object inside a pair of funnels — like a scoop of ice cream held between two cones — until he can feel the molecular structure of the cubic silicon crystal itself with his fingertips.
According to the Josephson effect, voltage can be produced in something called a superconducting junction by bombarding it with microwave radiation.
“You have only to count the atoms. No other knowledge is necessary.”
via WIREDZeit ist ein dehnbarer Begriff:
Soon after the advent of ticking clocks, scientists observed that the time told by them (and now, much more accurate clocks), and the time told by the Earth's position were rarely exactly the same. It turns out that being on a revolving imperfect sphere floating in space, being reshaped by earthquakes and volcanic eruptions, and being dragged around by gravitational forces makes your rotation somewhat irregular. Who knew?
via The official Google BlogRöntgenlaser, Einstein und Farbstoffmoleküle in einem Text.
Bonner Physikern ist es etwas gelungen, das lange als unmöglich galt
via Spiegel Online
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