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Thermodynamic Metrology Group

Welcome
Temperature and humidity thumbnailThe Thermodynamic Metrology Group realizes, maintains, and disseminates the national measurement standards for temperature, humidity, pressure, vacuum, and leaks. The Group advances thermodynamic measurements and applications; calibrates sensors and disseminates practical standards; participates in international comparisons to validate national standards; develops measurement methods, devices, and reference materials and data; assists users in the assessment of measurement uncertainty; prepares and promulgates evaluations and descriptions of measurement processes; coordinates national and international measurement standards and methods; and determines the uncertainty of the national standards with respect to fundamental thermodynamic definitions.
Programs/Projects

Pressure— The NIST Thermodynamic Metrology Group (TMG) provides critical research into pressure measurement capabilities improving uncertainties in user facilities and developing new national standards. …

Humidity—The NIST Thermodynamic Metrology Group maintains and develops national standards of humidity (in the range 1 nmol/mol to 0.6 mol/mol of water concentration), and supports calibration of all types …

Thermometry—The NIST Thermodynamic Metrology Group maintains and develops national standards of temperature (in the range 0.65 K to 1235 K), and supports calibration of all types of contact thermometers up to …

Spectroradiometry of sources—Calibration standards for spectral radiance and spectral irradiance are disseminated in the form of transfer lamps and integrating sphere sources. These disseminated standards are made traceable to …