(Via phys.org) For close to four centuries, mercury gauges have reigned as the most accurate way to measure pressure, but with the development of a new instrument by the National Institute of Standards and Technology (NIST), called a fixed-length optical cavity (FLOC) pressure can now be measured by detecting small changes in the wavelength of light passing through a cavity filled with nitrogen gas. The new design has potential to be an excellent factory-floor pressure instrument that could be used by a wide array of industries, including those related to glass, semiconductor, and aerospace manufacturing.

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Featured image:  NIST Advanced Measurement Laboratory in Gaithersburg Maryland