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The kilogram project: a silicon sphere is been measured.

Avogadro Project

How many atoms make a kilogram? PTB is answering this question in the Avogadro Project with the help of an almost perfect single crystal of silicon – and in this way it is contributing significantly to the redefinition of the kilogram and the mole.
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PTB - The National Metrology Institute of Germany

PTB's profile of tasks

In Braunschweig and Berlin, time comes from atomic clocks, lengths are measured far into the nano-world, scientists do research on fundamental questions concerning the physical units, and the employees in the laboratories calibrate measuring instruments, meeting the most demanding requirements. Therefore, the Physikalisch-Technische Bundesanstalt is among the top names in metrology worldwide. As Germany's national metrology institute, PTB is Germany's highest authority when it comes to correct and reliable measurements. It is the supreme technical authority of the Federal Ministry for Economic Affairs and Energy (BMWi) and employs a total of approx. 1900 staff members. PTB operates an integrated Opens internal link in current windowquality management system which covers the four interlinked field of business. (Initiates file downloadSelf-Declaration on quality management).

Corporate logo of the Federal Ministry for Economic Affairs and Energy

The Physikalisch-Technische Bundesanstalt, the National Metrology Institute of Germany, is a scientific and technical higher federal authority falling within the competence of the Federal Ministry for Economic Affairs and Energy.

What's New

In der frisch gereinigten Si-Kugel spiegelt sich PTB-Mitarbeiter Volker Görlitz. Foto: PTB

Massenormale der PTB für das neue Kilogramm sind einsatzbereit

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,...

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MITNETZ STROM und exceeding solutions entwickeln gemeinsam mit der Physikalisch-Technischen Bundesanstalt Prüfmittel für intelligente Messsysteme

Der enviaM-Netzbetreiber MITNETZ STROM hat gemeinsam mit dem Ingenieurbüro exceeding solutions UG, Merseburg, das bundesweit erste Prüfmittel entwickelt, das alle eichrechtlich relevanten Funktionen...

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Verleihung des Helmholtz-Preises für neue messtechnische Verfahren auf Weltklasse-Niveau

Der bedeutendste Preis der Metrologie, der Wissenschaft des Messens, wird am 22. Juni 2016 in Braunschweig verliehen. Die Feierlichkeiten finden im Seminarzentrum der Physikalisch-Technischen...

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Measurement of the dynamic mechanical properties of viscous materials

In microsystems metallic components are increasingly being replaced by those from low-cost polymers. For the thickness measurement of polymers, there is now the DIN standard 32567 available, which...

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Current Publications

PTB-News 1.2016

Three times a year, PTB News provides topical information from the varied spectrum of activities of the Physikalisch-Technische Bundesanstalt (PTB).
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Annual Report 2015

The Annual Report 2015 summarizes last year's news, developments, and projects.
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PTB-Mitteilungen

PTB-Mitteilungen 4.2015, Das Jahr des Lichtes
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News from the divisions

Neues Laseroptisches Volumenstrom-Normal [ more ]

Label free cell differentiation in whole blood based on multiple frequency AC impedance and light scatter analysis in a micro flow cytometric sensor [ more ]

New 28Si Single Crystal for the Avogadro Project of the PTB [ more ]

2016 Physik-Studienpreis by the Physikalische Gesellschaft zu Berlin [ more ]

Robust membrane hydrophone for the measurement of high-intensity therapeutic ultrasonic fields [ more ]

Quality Infrastructure is the Key to the Development of Renewable Energy in Asia [ more ]

European metrology research program: Successful completion of three projects and launch of a new one [ more ]

Geometric error mapping at a machine tool for varying environmental temperatures [ more ]

PTB calibration service for airborne ultrasound [ more ]

Smooth, smoother, atomically smooth – Technology for preparation of new step height standards [ more ]