SPOILER ALERT:
The official UK and USA metrology websites are INACCURATE
Since the inception of the International System of Units (SI) in 1960, it has always been recognised that some non-SI units, such as the litre, minute and hour, are “widely used and are expected to continue to be used for many years”.
Continue reading “Which non-SI units are accepted for use with the SI?”
Whether it is twips for typographic screen measurements, hands for horses’ heights or furlongs for horse racing, many imperial units are used for specific purposes. By contrast, the International System of Units (SI), the modern version of the metric system, is based on the principle that each measurable phenomenon has one basic named unit and all the multiples and subdivisions of the unit then follow the same logical structure using prefixes.
Continue reading “Universal metric or particular imperial?”The BIPM’s SI brochure states “The numerical value always precedes the unit and a space is always used to separate the unit from the number.” and says that the space, not a comma or a dot, shall be used for the thousands separator. There are several space characters in computing, but the brochure does not state what kind of space you should use when typing. Ideally, you would use a non-breaking space to ensure that no line break separates the numerical value from the unit. Users face the same issue when using a space for the thousands separator.
Continue reading “Space dilemmas for writing metric symbols and thousands separators”In December 2022, the Department for Business, Energy & Industrial Strategy (BEIS) published a report called “UK Measurement Strategy for the National Measurement System”. It describes the importance of measurement in our everyday lives but says little about the central role of the metric system in the UK National Measurement System (NMS). In fact, it barely mentions it.
Continue reading “The central role of the metric system in the UK National Measurement System”The International Bureau of Weights and Measures (BIPM) has formally approved the use of four new SI prefixes to meet the growing needs of science, computing and the increasing amount of online data and to prevent the adoption of unofficial prefix names. The approval of the new prefixes was one of the resolutions of the 27th General Conference on Weights and Measures, which took place on 15-18 November 2022.
Continue reading “First new SI prefixes for over 30 years”After celebrating the arrival of decimal currency in the UK 50 years ago, Metric Views now goes back to basics on decimal measurement. No, we shall not be looking at nautical distances or Gunter’s chain! Continue reading “How metric units fit together”
One of our regular contributors, Ronnie Cohen, has followed up on Martin Vlietstra’s article about the “new kilogram”, with a summary of the forthcoming changes to SI. It proved difficult to create some of the symbols used by SI in the text editor used by Metric Views, and readers who require the full story may wish to visit https://www.bipm.org .
Recent experience in France and Greece and a comment last week by Charlie P on this site has prompted us to ask if it would be better if supporters of metric measures were less pedantic.
It was announced today that the new polymer £50 note will celebrate the UK’s achievements in science, and will feature a prominent British scientist. Nominations from the public are invited.
As the UK’s metric changeover drags on with no end in sight, we consider if the advantages of encouraging widespread use of the centimetre outweigh the risks.
Metric Views 