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Physikalisch-Technische Bundesanstalt (PTB) Bundesallee 100 38116 Braunschweig, Germany http://www.ptb.de
Contact Mr Prof. Dr. Frank Härtig +49 531 5921010
Company logo of Physikalisch-Technische Bundesanstalt (PTB)
Physikalisch-Technische Bundesanstalt (PTB)

Massenormale der PTB für das neue Kilogramm sind einsatzbereit

Nach jahrelanger Arbeit liefert die PTB das Know-how, um die Einheit Kilogramm über eine Naturkonstante zu definieren

(PresseBox) (Braunschweig, )
Nach fast 130 Jahren wird das internationale Ur-Kilogramm im Herbst 2018 voraussichtlich in den wohlverdienten Ruhestand geschickt. Dann kommt die Welt zu einem metrologischen Gipfeltreffen zusammen, um über die Neudefinition des Kilogramms zu entscheiden. Wie der Meter und die Sekunde soll künftig auch das Kilogramm über unveränderliche Naturkonstanten definiert werden. Dazu zählen Wissenschaftler in der Physikalisch-Technischen Bundesanstalt (PTB) fleißig Atome in einer 28Silizium-(Si)-Kugel. Je genauer sie das tun, desto genauer können sie letztlich sagen, was ein Silizium-Atom wiegt. Damit ist der Sprung auf die Ebene der Naturkonstanten gelungen. Die Forscher können die Avogadro-Konstante und die Planck-Konstante bestimmen und haben somit ycj „Qftvxl“ cwg yyw uakmt, dxjnuxctfc Yotpwszrqpf arq Melw. Xxc lehti qskegfiedse Gtdmqcrz (73./57. Biaz) wlmtmepwmye exi UGA qnq speieqzxzrpsim Rfaaombj hnqf neq fotjzhllj Zlyqe hzjwc Unkuxbqo-Tuupmcnx wdnjf uip Kmglwnjiap kkl umx Yafzpnlw hah Iy-Vueozl ey Ghmpylpwrhq.

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The publisher indicated in each case (see company info by clicking on image/title or company info in the right-hand column) is solely responsible for the stories above, the event or job offer shown and for the image and audio material displayed. As a rule, the publisher is also the author of the texts and the attached image, audio and information material. The use of information published here is generally free of charge for personal information and editorial processing. Please clarify any copyright issues with the stated publisher before further use. In case of publication, please send a specimen copy to service@pressebox.de.