Officials with the General Conference on Weights and Measures (CGPM) have announced that at a meeting to be held next week, four of the base units used in the metric system will be redefined. The four ...

Scales aren't changing and the weather won't be noticeably different, but on May 20 the definitions that underlie what your scale and thermometer report—along with standard definitions used in ...

A new definition of the kilogram is required, an international team of scientists contends. The current one is imprecise, they say, because it is not linked to an unvarying property of nature. The ...

The International System of Units (SI Units), adopted in 1960, is the global standard for consistent measurement, replacing disparate systems. It has 7 base si units and all other units are derived ...

The new kilogram (unit of weight) and three other new base units - ampere (electric current), Kelvin (temperature) and mole (amount of substance such as atoms) - will now not be based on 'physical ...