Market Expertz | November 20, 2018
In November 2018, Scientists and Metrologists came together during the General Conference on Weights and Measures to decide that, the Standard International Units (SI units) which are used across the world, the seven units; need to be defined in terms of immutable, fundamental, universal, physical constants.
As of now the platinum iridium cylindrical alloy which is kept in a Paris vault is the standard unit of kilogram. Multiple replicas are available across the world, but scientists discover each year, whenever they are compared, minor variations are observed. Though the cylinder is only removed from its secured housing after every 40 years, the process is very delicate. The hydrocarbons on finger prints or moisture in air could contaminate the original pristine surface, which could potentially cause a tiny change in the mass leading to the change in the world’s definition of a kilo. The average gain of the International prototype kilogram is around 50micrograms (millionth of a gram) over 100 years. This change in mass is roughly the weight of a fly’s wing. So a completely new definition of kilogram in terms of Planck’s constant which is a universal constant has been found. A new kilogram will be defined as “h” Planck’s constant (relating weight to electric current) which will be equal to 6.62*10^(-34) Joules second, which is nothing but kilogram meter square per second.
The new era of Science and technology where precision measurements matter, eggheads in the world of measurement think that even the weight of fly’s wing is an unacceptable change and we need to go back to universal constants rather than physical things which deteriorate over time.