Mastodawn

1 dm [decimeter] is 3.9~ inches. I think this is a surprisingly useful every day metric for round about sizes. This is kinda the size I put my hands out for when describing small melons or large tomatoes. 1 dm is also about the size of a good small cheeseburger. 2 dm is about the biggest cheeseburger I think I have reasonable handle to fit in my mouth.

#ForbiddenMetricUnits #UnitsofMeasurement #Metric #sinning

Esmie Nov 28

A few inches is still a couple of centimeters.

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

Planetary Ecologist Oct 13

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

#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

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

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

@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