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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

Experiment in space intends to test the equivalence principle with so far unrivalled accuracy testen

Were Galileo, Newton and Einstein mistaken? At least just a little? Thanks to them, today we know that heavy mass and inertial mass are different approaches to describe the same physical effect: mass....

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Laseroptisches Durchflussnormal

Laseroptisches Durchflussnormal für Heißwasser

In Wärmekraftwerken kommt es darauf an, das Volumen des heißen Wassers möglichst schnell und exakt zu bestimmen. Für die Kalibrierung der entsprechenden Messgeräte vor Ort, also während des laufenden...

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Helmholtz Prize for two groundbreaking measurement methods

In principle, helium doesn’t like combining with its ilk at all. Yet, occasionally, it does exactly this, albeit with extremely slight binding energies. Scientists at Goethe University Frankfurt have...

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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

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

Informationsveranstaltung am 9. Juni 2016 um 13.00 Uhr im Hörsaal des Hermann-von-Helmholtz-Baus der PTB-Berlin [ more ]

PTB calibration service for airborne ultrasound [ more ]

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

Virtuelles Modell für ein metrologisch rückgeführtes UHV-STM [ more ]

Substantial contribution to the most important scientific conference on electrical metrology: CPEM 2016 [ more ]

Start des EMRP Projektes SIP-ENV02 Autopart [ more ]

EMRP-Projekt „Metrology for ammonia in ambient air“(ENV55-MetNH3) [ more ]

Start des Kooperationsprojektes zwischen PTB und AVL [ more ]

Neues photoakustisches NH3-Spektrometer für EMRP-Projekt "Metrology for airborne molecular contamination in manufacturing environments" (IND63 MetAMC) [ more ]