Crystalline silicon 28 and 1000 grams Standard
Posted by sunny27 on Feb 04, 2010Crystalline silicon 28 and 1000 grams Standard
As we all know apple ibook g4 14 battery, today’s “1000 grams” Weight is kept in Paris, France, a platinum-iridium alloy benchmark. However, scientists have noted that, in another about 100 years, the alloy atoms gain or loss may be caused by changes in the quality of about 0.1 mg. Fortunately, as one of the world’s most pure silicon-28 crystals of the birth, the researchers toward the redefinition of one kilogram of a further step.
To improve the standard weight of a more ideal way is to create a crystal, so that scientists can accurately determine the type and quantity of these atoms. In other words, the “1000 grams” weight and the quality of a single atom linked to improve the accuracy of the benchmark apple macbook pro 13 battery. However, the researchers attempt to show that for the natural silicon, using isotope ratio mass spectrometry determination of silicon, the introduction of the error is larger.
Therefore, the Institute of Crystal Growth in Berlin, Germany (Institute of Crystal Growth in Berlin) Helge Riemann led the team started to focus on a very pure silicon crystal research. The researchers spent six months time will be one from Russia, 99.994% purity silicon raw material 28 to melt repeatedly impurity, culminating in the May 23 to be an ideal of pure silicon-28 crystals, for every 10 million silicon-28 atom contains only one other atom apple macbook pro 15 battery.
Piece of weight 5 kg of pure silicon crystal is about to be divided, and the next year produced two 1 kg sphere. However, scientists also take a few years time to carry out isotope analysis, X-ray crystal accumulation of research and determination of the sphere volume, and thus accurately determine their apple macbook pro 17 battery quality.
If all goes well, the new “1000 grams” standard error of only about a few milligrams per cent. Although the new silicon-28 crystals which over time will change, but on behalf of “1000 grams” quality of the number of atoms of silicon 28 is always constant and meaningful.
It is worth mentioning that the pure crystal is not the only way scientists have tried. Some research team is definitely the quality of an object by apple powerbook g4 12 battery measuring the gravitational and electromagnetic fields generated to determine the new “1000 grams” standard. However, we will try our objectives are the same, that is, to “1000 grams” of the error reduced to 0.02 mg.