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The kilogram and measurements of mass and force.
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This paper describes the facilities, measurement capabilities, and ongoing research activities in the areas of mass and force at the National Institute of Standards and Technology (NIST). The first section of the paper is devoted to mass metrology and starts with a brief historical perspective on the developments that led to the current definition of the kilogram. An overview of mass measurement procedures is given with a brief discussion of current research on alternative material...
Related newspaper, magazine, and journal articles from HighBeam Research
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May the force be with you: effective force testing procedures can capture manufacturing defects soon after they occur, helping minimize costly product returns, recalls and brand damage.(QUALITY MEASUREMENT)
Quality
; ... nondestructive test is spring testing; specifically, measuring the compression or tension force of a spring at a specific displacement. After compressing or stretching a spring ... exceeded. It is easy to think about situations in which springs with inappropriate force behaviors would be a problem. Just consider ...
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New Kilogram Standard
Morning Edition (NPR)
; ... This is MORNING EDITION. I'm Bob Edwards. Most precise measurements are based on unchanging natural phenomena. The meter or ... radiation from particular atoms. But the basic unit of mass, the kilogram, is not a phenomenon, it' s a thing, a cylinder of metal ... working on a new definition for the world's ...
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A step closer to an atomic-based kilogram?(new standard for weight measure under development)(Brief Article)
Science News
; ... global standards for length, mass, time, and other fundamental quantities, only the kilogram remains a physical object ... other ways slightly changes mass with age--and might be lost ... standard based on a carbon atom's mass or other fixed quantity of ... report that by weighing the kilogram ...
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Redefining the kilogram.(measuring standards)(Brief Article)
Machine Design
; The kilogram is the last of the seven basic units on the ... closer to making a similar definition for the kilogram based on the watt balance. The device measures the force needed to balance a 1-kg mass artifact against the Earth's gravity, as well as two electrical values. These measurements ...
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Watt-balance method accurately defines the kilogram.(pulse)(Brief Article)
EDN
; ... the current international standard for the kilogram, a century-old cylinder of platinum-indium ... is a two-story-high apparatus that redefines mass in terms of fundamental physics and quantum standards. It measures the force necessary to balance a 1-kg-mass artifact against the pull of the Earth's ...
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