When a retailer weighs out his product in front of the customer, can the customer trust the scales? It is usually up to local government to certify the accuracy of such scales, though in recent years, certification of measuring devices within much of the world has been privatised with various countries’ national laboratories overseeing the certification process.
Continue reading “Is that really one kilogram?”Category: Technical
Which non-SI units are accepted for use with the SI?
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?”
Early Metrication on Southern African Railways
During the last decade of the nineteenth century, events in Southern Africa were dominated by the gold rush as adventurers scrambled to exploit the newly discovered in the Johannesburg area. This and the egos of and animosity between the financier and Cape Colony prime minister Cecil John Rhodes and the aging and dour president of the Transvaal Republic Paul Kruger resulted in the Anglo-Boer War of 1899-1902.
Continue reading “Early Metrication on Southern African Railways”Driverless Cars
The on-going development of driverless cars is seldom out of the headlines. There are questions about the reliability of the software which will drive the cars and who will be liable should there be an accident.
Continue reading “Driverless Cars”International Vocabulary of Metrology
International Vocabulary of Metrology (VIM) is a “System of Units”, not a “System of Measurement”. The VIM explains the terminology used in publications related to measurement, including the official SI brochure.
Continue reading “International Vocabulary of Metrology”International Organisation for Legal Metrology
The International Organisation for Legal Metrology (OIML from the French “Organisation Internationale de Métrologie Légale”) is housed in a non-descript office in the Rue Turgot in the 9th arrondissement of Paris and is about 700 metres the from the Gare du Nord. Like the BIPM, the OIML is an inter-governmental organisation which gives its staff quasi-diplomatic status, though, like the BIPM, French nationals pay French income tax. The OIML works closely with BIPM, the International Standards Organization (ISO) and other international bodies in coordinating metrology around the globe, with each organisation having its own specific role.
Continue reading “International Organisation for Legal Metrology”What are binary prefixes?
When four new SI prefixes were added to the International System of Units (SI) in November 2022, one of the main reasons cited for their need was for their use in data science, where the numbers involved in describing quantities of information have become ever larger. e.g. The amount of data generated by the internet is projected to hit 175 zettabytes by 2025.
Universal metric or particular imperial?
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?”Metric system can meet all astronomers’ needs
The metre used with the appropriate prefix is capable of measuring vast distances across the universe and the tiniest particles in the universe. These prefixes remove the need to use enormous numbers with lots of trailing zeroes. So why do astronomers continue to use astronomical units (AU), light years and parsecs? These non-standard units can be replaced by the metric unit of length, the metre, with the appropriate prefix.
Continue reading “Metric system can meet all astronomers’ needs”Why Progress uses dual measurements in their sample applications
Progress Software Corporation (Progress) is a multinational company that provides software for developing and deploying business applications. I came across one of their sample applications that uses dual temperature measurements and wondered why it uses two temperature scales when one would be enough. I asked Progress about this. Read on to find out their response to my query.
Continue reading “Why Progress uses dual measurements in their sample applications”
Metric Views 