Mastodawn

Recently, I was discussing about the pros and cons of different unit ontologies. However, I was not able to really express, why I am in favor of an ontology, which not only provides the direct conversion factors between units for direct application, but also provides the explanation for these values. In her keynote, Maria-Esther Vidal provided an explanation for my intuition (free after Aristotle): "We think we know a thing only when we know its cause." #eswc2026 #UnitsOfMeasurement #Ontologies

Units of Measurement Mar 31

#EclipseUOMo graduated from the #incubator a little over a month ago, as seen in the project details: https://projects.eclipse.org/projects/technology.uomo Congratulations and thanks to everyone involved at @EclipseFdn and the wider #UnitsOfMeasurement community. #Java #Units

Eclipse UOMo

Eclipse UOMo adds Units of Measurement support for IT Systems and Services both to common programming languages like Java and Data Exchange standards like UCUM and formats including UnitsML, Sensor

projects.eclipse.org

Esmie Nov 28, 2025

A few inches is still a couple of centimeters.

#MetricVsImperial #MeasurementMatters #InchesToCentimeters #LengthConversion #MathIsFun #ScienceFacts #UnitsOfMeasurement #ConvertIt #MetricSystem #ImperialSystem

Planetary Ecologist Oct 13, 2025

Centimorgan (Genetics 🧬)

In genetics, a centimorgan or map unit is a unit for measuring genetic linkage. It is defined as the distance between chromosome positions for which the expected average number of intervening chromosomal crossovers in a single generation is 0.01. It is often used to infer distance along a chromosome. However, it is not a true physical distance.

https://en.wikipedia.org/wiki/Centimorgan

#Centimorgan #Genetics #DimensionlessUnits #UnitsOfMeasurement

Centimorgan - Wikipedia

David Grayless Sep 28, 2025

#RotationalFrequency, also known as rotational speed or rate of rotation (symbols ν, lowercase Greek nu, and also n), is the frequency of rotation of an object #aroundAnAxis. Its #SIUnit is the #reciprocalSeconds (s−1); other common #unitsOfMeasurement include the #hertz (Hz), #cyclesPerSecond (cps), and #revolutionsPerMinute (rpm). Rotational frequency can be obtained dividing #angularFrequency, ω, by a full #turn (2π #radians): ν=ω/(2π rad).

Jan Martin Keil Sep 5, 2025

Tiny mistake, huge effect:
Due to a single wrong statement "day subclass of counting unit" (http://www.wikidata.org/entity/statement/Q573-b8a19c53-425d-0009-2c55-decdfeb3ff19), #Wikidata / @wikidata classifies every resource representing a calendar date, like "November 12, 1655" https://www.wikidata.org/entity/Q69107205, as unit. As a result, a query for all #UnitsOfMeasurement returns > 210.000 instead of < 7000 resources.

day

unit of time lasting 24 hours, derived from the period of Earth's rotation about its axis

Michael J. Gratton Aug 29, 2025

Picking up work on an old Java project that has it's own half-baked units of measurement API, I was chuffed to discover JSR 363 - Unit of Measurement API. Maybe I don't need to keep maintaining this custom implementation any more?

But looking deeper, it literally only has support for basic maths operations, and you can't even specify basic stuff like significant digits or rounding modes. A `BigDecimal` value of "100.00" gets coerced to an `int`.

What good is an API for strongly typing and converting physical measurements if you can't effectively perform operations on them?

https://unitsofmeasurement.github.io/unit-api/

#java #unitsofmeasurement #jsr363

Units of Measurement - API

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C.Jul 28, 2025

@Satori

New ISO standard unit of mass - or maybe volume - just dropped!

The "floof" is a little large as a base unit, so it's most commonly encountered as microfloofs, like with capacitors measured in microfarads.

It joins the other oddball units commonly encountered in news articles - volume in Olympic swimming pools, length in double-decker buses, mass in elephants, etc.

#units #UnitsOfMeasurement #floof