Primary low force balance

Primary low force balance

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

Caption: Primary low force balance. This machine measures very small forces using electrical and dimensional analysis to establish the primary standard for forces of 10 micronewtons (millionth of a newton) or less. The balance measures from 10 micronewtons to 1 nanonewton (billionth of a newton), with a resolution of 50 piconewtons (trillionth of a newton). It produces the most accurate measurement of minute forces to date (as of 2007). Previously, these forces had been measured using the weight of their mass in a gravitational field, Masses under 1 milligram, however, are too small to be measured accurately this way, so the primary low force balance was introduced to solve this flaw. Photographed at the National Physical Laboratory in Teddington, UK.

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Keywords: balance, britain, british, device, equipment, instrument, lab, laboratory, low forces, machine, measure, measurement, measuring, micronewton, nanonewton, national physical laboratory, npl, physical, physics, piconewton, pressure, primary low force balance, primary standard, science, scientific, teddington, uk, united kingdom

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