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Archives of the Austrian Resistance

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Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Archives of the Austrian Resistance
Phone:
+43 1 22894693

Address:
Wipplingerstrasse 6-8, Vienna 1010, Austria

The kilogram or kilogramme is the base unit of mass in the International System of Units , and is defined as being equal to the mass of the International Prototype of the Kilogram , a cylinder of platinum-iridium alloy stored by the International Bureau of Weights and Measures at Saint-Cloud, France. A new standard, defined in terms of invariant constants of nature, is expected to take effect in 2019.The kilogram was originally defined as the mass of a litre of water at its freezing point. That was an inconvenient quantity to precisely replicate, so in the late 18th century a platinum artefact was fashioned as a standard for the kilogram. That artefact, or an exact replica thereof, has been the standard of the unit of mass for the metric system ever since. Though the IPK, the current primary artefact, and its replicas are stored in carefully controlled laboratory conditions, their masses have been subject to fluctuation as a result of poorly understood factors, possibly including handling, cleaning and contamination. The IPK has diverged from its replicas by 50 μg since their manufacture late in the 19th century. This has led to efforts to develop measurement technology precise enough to allow replacing the kilogram artefact with a new standard. The avoirdupois pound, used in both the imperial and US customary systems, is defined as exactly 0.45359237 kg, making one kilogram approximately equal to 2.2046 avoirdupois pounds. Other traditional units of weight and mass around the world are now also defined in terms of the kilogram, making the kilogram the primary standard for virtually all units of mass on Earth.
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