New definition of kilogram on the cardsNovember 14th, 2007 - 8:16 am ICT by admin
SI units are defined by the General Conference on Weights and Measures, whose next meeting this month will consider a range of issues related to the maintenance of the SI. This will include an initial proposal to prepare for the redefinition of several of the base units.
This meeting could also include redefining mass relying on a physical constant - a physical quantity that is universal in nature and constant in time.
For 30 years, scientists across the world have been looking to measure the value of a physical constant as accurately as possible using the existing man-made unit for a kilogram. Once they have achieved this, the fixed value of one of these constants can be incorporated it into a new definition of the kilogram.
The research has been going on with a method known as Planck’s constant, which uses an indirect comparison of mechanical and electrical power to measure the kilogram using length, time and quantum mechanical effects.
For the proper redefinition of the kilogram, it is necessary that no differences crop up in the results of the research. But, research from the UK’s National Physical Laboratory (NPL) measuring Planck’s constant using its Mark 2 watt balance show a significant discrepancy in the results.
According to Seton Bennett, Deputy Director at the National Physical Laboratory, “Given the inconsistency in these results, further results are required before the CGPM ( Conf
- Model kilogram losing weight, scientists mull alternative - Jan 24, 2011
- Kilogram is losing weight, say experts - Jan 24, 2011
- Viral protein structure could strengthen HIV therapy - Jun 23, 2010
- Kilogram to be redefined by 2011 - Mar 01, 2008
- Finland owes innovative bent to research spending - Oct 02, 2011
- US astronomer receives top prize in China - Aug 22, 2012
- Breakthrough in developing graphene may lead to high-speed electronics in future - Jan 20, 2010
- Novel measurement method may help in battle against cancer - Jan 27, 2010
- Soon, intelligent harvesting robots to take over UK farmers - Aug 12, 2009
- How variations in Sun's energy contribute to climate change - Jan 15, 2011
- Dream content measured for first time - Oct 30, 2011
- 'Purified' silicon nudges quantum computing ahead - Jun 11, 2012
- New treatment could help minimize nerve damage in spinal cord injuries - May 04, 2011
- Well-informed people eat better - Jan 17, 2012
- US Air Force creates supercomputer from 1,760 PlayStation 3s - Dec 28, 2010
Tags: constants, deputy director, discrepancy, electrical power, general conference, inconsistency, initial proposal, international system of units, kilogram, mechanical effects, national physical laboratory, npl, physical constant, physical quantity, planck, seton, weights and measures