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Metrology

Amount of substance

News and Updates

schematic of sound-wave transmitter and receiver

Sounding Out a New Way to Measure Gas Flow

Researchers at NIST have developed a new — and sound — way to accurately measure the rate at which gas flows in and out of a vessel. The technique, which uses

Events

Forensics@NIST 2024

FORENSICS@NIST 2024

Mon, Nov 18 - Thu, Nov 21 2024
THE MAIN EVENT: NOVEMBER 18-20, 2024 Join us virtually on Monday November 18th - Wednesday November 20th, 2024 to learn

Projects and Programs

Cannabis

NIST Tools for Cannabis Laboratory Quality Assurance

Ongoing
Since the 1970s, cannabis (marijuana and hemp) and its constituent, Δ 9-tetrahydrocannabinol or THC, have been classified as Schedule I controlled substances. Seized evidence is tested by forensic laboratories, which verify the identity of the plant through macro- and microscopic evaluation and the
MMQAP figure

Micronutrients Measurement Quality Assurance Program (MMQAP)

Completed
The MMQAP supported the long-term (months to years) reliability of selected fat- or water-soluble vitamin measurements in human serum and plasma. Results from the comparison studies helped participants to make accurate clinical and health-care decisions as well as to maintain and improve their
Map of the world, with six colors used to identify the six regional metrology organizations.

International Comparisons for Chemical Measurements

Ongoing
International agreements and decisions concerning trade and our social well-being increasingly require mutual recognition of measurements and tests among nations. The Mutual Recognition Arrangement (MRA) on national measurement standards and calibration and measurement certificates issued by NMIs
Photograph of SRM 2378 Fatty Acids in Human Serum showing three vials labeled Serum 1, Serum 2, and Serum 3.

Fatty Acids in Human Serum and Plasma Quality Assurance Program (FAQAP)

Completed
Interlaboratory comparison studies of the FAQAP focused on the measurement of 24 fatty acids in selected serum and plasma matrices. Frozen or freeze-dried serum or plasma samples were sent to laboratories for analysis together with control materials. Results were returned to NIST for data evaluation

Publications

NIST's Engagement with CCQM Studies from 1992 to 2023: History and Performance

Author(s)
David L. Duewer, Christina Cecelski, Megan Cleveland, Nancy Lin, Katrice Lippa, Jacqueline L. Mann, John L. Molloy, Michael Nelson, James E. Norris, Kenneth W. Pratt, Sumona Sarkar, Hratch G. Semerjian, Robert L. Watters
This report documents the engagement and measurement performance of the National Institute of Standards and Technology (NIST) in studies coordinated by the

Tools and Instruments