Mass metrology

News and Updates

NIST Researchers Link Cutting-Edge Gravity Research to Safer Operation of Construction Cranes

February 17, 2022

In the beginning, all that Stephan Schlamminger wanted to do was to write down an equation that would help him obtain a more precise value for G, the

Sneezes, Rain Clouds and Ink Jets: NIST Improves the Ability of Optical Microscopes to Measure the Volume of Microdroplets

December 20, 2021

Sneezes, rain clouds, and ink jet printers: They all produce or contain liquid droplets so tiny it would take several billion of them to fill a liter bottle

Measuring Up: NIST Calibrates Masses for Unique Air Force Deadweight Machines

November 18, 2021

Mechanical engineers at the National Institute of Standards and Technology (NIST) have just finished calibrating several dozen large metal masses, which will be

Projects and Programs

Metrology and Standards for Nanoscale Stress

Ongoing

Our objective is to develop accurate measurement methods for the nanoscale stress distributions and surface defects that control device performance and

Quantifying the environmental contributions to mass change

Ongoing

Since the inception of the SI system of units, physical mass artifacts have been disseminated in order to realize the unit of the kilogram, essential to a broad

Precision Electro-Mechanical Experiments (PREME)

Ongoing

The Precision Electro-Mechanical Experiments (PREME) program develops precision electro-mechanical measurements for fundamental traceability of the SI units and

Nanometrology: Composition and Structure of Nanomaterials

Ongoing

Advances in methods, instrumentation and analysis protocols are developed to enhance measurement science capabilities in nanomaterial elemental and

Publications

The kilogram: inertial or gravitational mass?

August 5, 2022

Author(s)

Stephan Schlamminger, Giovanni Mana

The redefinition of the international system of units fixes the values of the unperturbed ground state hyperfine transition frequency of the $^133}$Cs atom

Magnetic Uncertainties for Compact Kibble Balances: An Investigation

July 18, 2022

Author(s)

Shisong Li, Stephan Schlamminger

The Kibble balance has become one of the major instruments for realizing the mass unit, the kilogram, in the revised international system of units (SI)

Chromatography at -30 °C for Reduced Back-Exchange, Reduced Carryover, and Improved Dynamic Range for Hydrogen-Deuterium Exchange Mass Spectrometry

June 22, 2022

Author(s)

Kyle Anderson, Jeffrey W. Hudgens

For hydrogen-deuterium exchange mass spectrometry (HDX-MS) to have an increased role in quality control of biopharmaceuticals, H for D back-exchange occurring

Design of an electrostatic feedback for an experiment to measure G

June 20, 2022

Author(s)

Stephan Schlamminger, Leon Chao, Vincent Lee, David B. Newell, Clive Speake

The torsion pendulum at the heart of the BIPM apparatus to measure the gravitational constant, $G$, is used to measure the gravitational torque between source