Johnson Matthey
After the meeting last week in London, it is clear that the agreement on the new kilo not be achieved during the next meeting of the GFCM in October. The reason is the discrepancy between the two big experiments that have repesado per kilo depending on two constants. One is that Max Planck discovered in 1900 and the foundations of quantum physics. Another is the proposal by Amedeo Avogadro almost a century earlier to calculate the number of atoms in a gas based on your volume. Applied to the kilo, the proposals of both authors disagree. The exact magnitude of dissent is 0,00000017?, explains Mirandes Estefania, physical from Barcelona who works in the redefinition of the kilogram in the IBPM. This disagreement will be sufficient to delay the International Covenant until the next meeting of the CIPM, within four years.
Problems in the future there is a reasonable possibility that the new definition be adopted by 2015, but there is no certainty, explains Stock. Other three measures of the international system will have to wait until 2015 to be redefined: the mole, the ampere and the kelvin degree, something that don’t like all the experts involved. This issue could cause us problems in the future, confesses to this newspaper the physicist John Hall, an expert in the measurement of magnitudes by laser and winner of the Nobel in Physics in 2005. According to Hall, the redefinition may cause a disconnect with the past. The French weight was forged in London 131 years ago to reproduce as accurately called kilogram of the archives. It was a measurement equal to the weight of a liter of water which was set up by the Government of France in 1795, while the country waged a war against European powers that wanted to crush the revolution. The ampere, the kelvin and the Mole will be also reviewed the British company Johnson Matthey, still in operation, polished with great care a cylinder 39 mm high made of platinum for its weight reflects as much as possible to the liter of water.