Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Metrology

Flow metrology & rheology

News and Updates

Artist’s rendering of an organ-on-a-chip device

NIST-Led Working Group Developing Standards for Organ-on-a-Chip Research

February 22, 2024

When testing a new medicine, researchers must do more than assess how well that drug works. They also have to determine whether the medicine has some negative

Big Improvements in New Probe Design for Smokestack Emission Monitoring

July 31, 2023

Each year, to meet requirements set by the Environmental Protection Agency (EPA), coal-fired power plants must have their smokestack emissions audited by an

Sounding Out a New Way to Measure Gas Flow

March 31, 2023

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

Projects and Programs

Temperature Sensitivity of Liquid Flow Meters

Ongoing

The objective of this project is to characterize temperature effects on flow meters used in cryogenic liquids, e.g. turbine and Coriolis flow meters. With a

Atomic Standard for Pressure

Ongoing

NIST scientists are developing a highly accurate primary standard for pressure in the range 2 MPa to 7 MPa based on fundamental physical properties of helium

Acoustic Techniques in Fluid Metrology

Ongoing

The Fluid Metrology Group leads the world in designing and using gas-filled acoustic resonators for measuring the thermodynamic temperature T, the Boltzmann

The NIST Chemistry Webbook

Ongoing

The NIST Chemistry WebBook is a site on the Internet ( http://webbook.nist.gov/) that provides convenient access to a variety of physical and chemical property

Publications

Relaxation times and dynamic behavior of an optofluidic flow meter in the nanoliter per minute regime

February 29, 2024

Author(s)

Nicholas Drachman, Paul Patrone, Gregory A. Cooksey

Accuracy and temporal resolution of flow meters are often unacceptable below the microliter per minute scale, limiting their ability to evaluate the real-time

A Turbulence Model Sensitivity Analysis on the Hydraulic Behavior in the Inlet Plenum of the Proposed NIST Neutron Source Design

August 20, 2023

Author(s)

Abdullah Weiss, Joy Shen, Anil Gurgen

The NIST Neutron Source, or NNS, is a proposed reactor designed to eventually replace the aging National Bureau of Standards Reactor at the NIST Center for

Non-nulling Protocols for Fast, Accurate, 3-D Velocity Measurements in Stacks

July 28, 2023

Author(s)

Iosif Isaakovich Shinder, Aaron Johnson, James Filla, Vladimir B. Khromchenko, Michael R. Moldover, Joey Boyd, John D. Wright, John R. Stoup

We present protocols for making fast, accurate, 3-D velocity measurements in the stacks of coal-fired power plants. The measurements are traceable to

Simultaneous rheology and cure kinetics dictate thermal post-curing of thermoset composite resins for material extrusion

June 5, 2023

Author(s)

Stian Romberg, Anthony Kotula

Thermoset composites are excellent candidates for material extrusion because they shear thin during extrusion but retain their shape once deposited via a yield