20 May 2025
keilw
May 20 is World Metrology Day, commemorating the anniversary of the signing of the Metre Convention in 1875.
This year, we celebrate the 150th anniversary of the signing of the Metre Convention - a milestone that underscores a century and a half of international collaboration in measurement science. Also the OIML, the International Organization of Legal Metrology, turns 70 on October 12th this year.
The theme for World Metrology Day 2025 is Measurements for all times, for all people.
We also released version 2.2.2 of SI Units.
20 May 2024
keilw
May 20 is World Metrology Day, commemorating the anniversary of the signing of the Metre Convention in 1875.
The theme for World Metrology Day 2024 is Sustainability.
07 April 2024
keilw
Today marks the 10th anniversary of the JSR 363 approval.
Only 2 days before IoT Day 2024
Congratulations and thank you everyone who helped over all these years with JSR 363 and 385.
11 March 2024
keilw
Today Maintenance Release 2 of JSR 385 was published by the Java Community Process: https://jcp.org/aboutJava/communityprocess/mrel/jsr385/index2.html
Corresponding GitHub release tags for API are: https://github.com/unitsofmeasurement/unit-api/releases/tag/2.2
for the RI: https://github.com/unitsofmeasurement/indriya/releases/tag/2.2
and for the TCK: https://github.com/unitsofmeasurement/unit-tck/releases/tag/2.2
Thanks everyone who helped with this release.
08 January 2024
keilw
Today Maintenance Review Ballot for Maintenance Release 2 of JSR 385 at the Java Community Process finished. MR2 of JSR 385 was unanimously approved by the JCP Executive Committee: https://jcp.org/en/jsr/results?id=6364.
Maintenance Review 2 page: https://jcp.org/aboutJava/communityprocess/maintenance/jsr385/index2.html
GitHub project to track the MR: https://github.com/orgs/unitsofmeasurement/projects/7
31 October 2023
keilw
Happy Halloween!
Today is also Reformation Day.
And the the final artifact of JSR 385 MR 2 was released as well:
* unit-tck 2.2
26 June 2023
keilw
Happy birthday, Lord Kelvin. It’s World Refrigeration Day.
Lord Kelvin was born 199 years ago: June 26th, 1824. 26 June is also World Refrigeration Day.
All info here: https://worldrefrigerationday.org/
Today further artifacts of JSR 385 MR 2 were also released:
* uom-lib 2.2
* indriya 2.2
20 May 2023
keilw
May 20 is World Metrology Day, commemorating the anniversary of the signing of the Metre Convention in 1875.
The theme for World Metrology Day 2023 is Measurements supporting the global food system. This theme was chosen because of the increasing challenges of climate change, and global distribution of food in a world whose population reached 8 billion at the end of 2022.
Today the first artifacts of JSR 385 MR 2 were also released:
* uom-parent 2.2
* unit-api 2.2
14 March 2023
keilw
Happy Pi Day 2023!
Pi Day is celebrated on March 14th (3/14) around the world. Pi (Greek letter “π”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159. Pi Day is an annual opportunity for math enthusiasts to recite the infinite digits of Pi, talk to their friends about math, and eat pie.
Check out Pi Day for more.
18 November 2022
keilw
The General Conference on Weights and Measures (CGPM), at its 27th meeting,
recalling that decisions were made at previous meetings when it was considered timely to extend the range of SI prefixes including Resolution 12 (paragraph 3) adopted by the CGPM at its 11th meeting (1960), Resolution 8 adopted by the CGPM at its 12th meeting (1964), Resolution 10 adopted by the CGPM at its 15th meeting (1975), and Resolution 4 adopted by the CGPM at its 19th meeting (1991), decided to add to the list of SI prefixes to be used for multiples and submultiples of units the following prefixes:
| Multiplying factor |
Name |
Symbol |
| 1027 |
ronna |
R
|
| 10–27 |
ronto |
r
|
| 1030 |
quetta |
Q
|
| 10–30 |
quecto |
q
|
With an upcoming Maintenance Release 2 of JSR 385 we will add those new prefixes to MetricPrefix in the API.