Related Experiment Video
Updated: Jul 15, 2026

Design and Use of an Apparatus for Quantifying Bivalve Suspension Feeding at Sea
Published on: September 5, 2018
NBS/NIST Gas Thermometry From 0 to 660 °C
1National Institute of Standards and Technology, Gaithersburg, MD 20899.
Abstract:
In the NBS/NIST Gas Thermometry program, constant-volume gas thermometers, a unique mercury manometer, and a highly accurate thermal expansion apparatus have been employed to evaluate temperatures on the Kelvin Thermodynamic Temperature Scale (KTTS) that correspond to particular temperatures on the 1968 International Practical Temperature Scale (IPTS-68). In this paper, we present a summary of the NBS/NIST Gas Thermometry project, which originated with planning activities in the late 1920s and was completed by measurements of the differences t(KTTS)-t(IPTS-68) in the range 0 to 660 °C. Early results of this project were the first to demonstrate the surprisingly large inaccuracy of the IPTS-68 with respect to the KTTS above 0 °C. Advances in several different measurement techniques, development of new, specialized instruments, and two distinct sets of gas thermometry observations have resulted from the project.
More Related Videos
Related Concept Videos
Constant Volume Calorimetry
Temperature Measurement Sites
Oral: When assessing oral temperature, the thermometer tip should be placed under the tongue in the posterior sublingual pocket. It offers accurate readings and can be...
Thermometers and Temperature Scales
As many physical properties depend on temperature, the variety of thermometers is...
Gas Thermometers and the Kelvin Scale
Flame Photometry: Overview
The Joule and Joule–Thomson Experiments

