News tagged with micrograms
Two-thirds of China's cities fail on air standards
(AP) -- Two-thirds of China's cities currently fail to meet stricter air quality standards that the government wants to phase in over four years to combat notoriously smoggy skies, a senior Chinese environmental ...
Mar 02, 2012 |
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Golden rice an effective source of vitamin A
The beta-carotene in so-called "Golden Rice" converts to vitamin A in humans, according to researchers at Baylor College of Medicine and Tufts University in an article that appears in the current issue of the American Jo ...
May 13, 2009 |
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New genomic technique uncovers transcriptome of a reef-building coral
Using a new technique for cDNA preparation combined with the latest sequencing methods, researchers have uncovered the larval transcriptome of a reef-building coral (Acropora millepora). Their study, descri ...
May 12, 2009 |
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Kilogram
The kilogram or kilogramme (SI symbol: kg), also known as the kilo, 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 Kilogram (IPK), which is almost exactly equal to the mass of one liter of water. The avoirdupois (or international) pound, used in both the Imperial system and U.S. customary units, is defined as exactly 0.45359237 kg, making one kilogram approximately equal to 2.2046 avoirdupois pounds.
In everyday usage, the mass of an object given in kilograms is often referred to as its weight, which is the measure of the gravitational force—or heaviness—of an object. Weight given in kilograms is technically the non‑SI unit of measure known as the kilogram-force. The equivalent unit of force in the avoirdupois system of measurement is the pound-force. In strict scientific contexts, forces are typically measured with the SI unit newton.
The kilogram is the only SI base unit with an SI prefix as part of its name. It is also the only SI unit that is still directly defined by an artifact rather than a fundamental physical property that can be reproduced in different laboratories. Four of the seven base units in the SI system are defined relative to the kilogram so its stability is important.
The International Prototype Kilogram is kept in the custody of the International Bureau for Weights and Measures (BIPM) who hold it on behalf of the General Conference on Weights and Measures (CGPM). After the International Prototype Kilogram had been found to vary in mass over time, the International Committee for Weights and Measures (CIPM) recommended in 2005 that the kilogram be redefined in terms of a fundamental constant of nature. At its 24th meeting the General Conference on Weights and Measures (CGPM) agreed in principle that the kilogram should be redefined in terms of the Planck constant, but deferred a final decision until its next meeting, scheduled for 2014.
For more information about Kilogram, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
