Vacuum balance

Vacuum balance

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Credit: ANDREW BROOKES, NATIONAL PHYSICAL LABORATORY/SCIENCE PHOTO LIBRARY

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Caption: Vacuum balance. This balance is able to compare masses in air, inert gas or vacuum. This allows calibration and verification of mass. The metal cylinder at the front of the balance is the UK's national standard kilogram. Photographed at the National Physical Laboratory, Teddington, UK.

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Keywords: adult, balance, britain, british, calibration, comparing, comparison, england, english, europe, european, human, kilogram 18, machine, male, man, mass, mass comparator, measuring, metrology, national physical laboratory, national standard kilogram, npl one, one person, people, physics, scientist, teddington, uk, united kingdom, vacuum, verification, weighing, weight

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