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The Fluid Metrology Group leads the world in designing and using gas-filled acoustic resonators for measuring the thermodynamic temperature T , the Boltzmann
By measuring the speed of sound in argon gas, we have determined thermodynamic temperature with unprecedented accuracy in the range 0 °C to 552 °C. Our results
It is well known that the physical properties of a fluid can change profoundly, and often non-trivially, when placed in a confined environment. Only for the
Researchers in the Applied Chemicals and Materials Division play a leading role in the development of international standards for the properties of water. This
Components and devices used in a broad spectrum of technology sectors such as health care, communications, energy and electronics are manufactured from
In classical molecular simulations, electrostatic contributions to the potential energy are typically accounted for by assigning partial charges to some or all
We are developing new fixed points and new maintenance systems for use with Standard Platinum Resistance Thermometers (SPRTs) below the triple point of water
A variety of gases are used during production of semiconductors for deposition, lithography, etching, doping, annealing, and chamber cleaning. These processes
Flow meters that rely on measuring the pressure drop across a laminar flow element can be accurately calibrated using a benign surrogate gas (such as helium or
Compile and evaluate phase equilibrium data for NIST Standard Reference Database 31 (Phase Equilibria Diagrams) ; disseminate the data in a readily accessible
By using machine learning approaches, we seek to elucidate underlying universal characteristics of fluids and fluid mixtures that enable property prediction
We use machine learning and other computational techniques to predict the self-assembly characteristics of multicomponent colloidal materials. This is a
Our goal is to develop measurement techniques to characterize the changes in thermal transport and thermal transition temperatures in polymeric and hybrid
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
NIST Standard Reference Database 173 Last Update to Data Content: August 2023 DOI: https://doi.org/10.18434/T4M88Q The Standard Reference Simulation Website is
As part of the NIST on a Chip program, the Photonic Dosimetry project is developing in-situ sub-micrometer ionizing-radiation dosimetry and calorimetry leading
Photonic Thermometry is a cutting-edge research program at NIST that aims to break the fundamental limitations of electrical resistance-based thermometry and
PRIME (Platform for Realizing Integrated Molecule Experiments) aims to establish primary, quantum-based realizations for both the radiometric watt and kelvin
The NIST REFPROP database provides the most accurate thermophysical property models for a variety of industrially important fluids and fluid mixtures, including
Energy is one of the most critical problems facing the United States, with technical, economic, and public policy aspects. Our group develops state-of-the-art
Observing and measuring the dynamic changes that take place at the nanometer scale during the synthesis and operation of active nanostructures is vital for
Property measurements of the very highest accuracies are important for developing the thermodynamic and transport property models for working fluids and