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the theme for World Metrology Day 2019 is "the International System of Units—fundamentally better . the SI (International System of Units) units are now exclusively defined in terms of physical constants of atomic and quantum phenomena . SI helps make possible many advances in science, engineering, and medicine.
SI (International System of Units) is defined in the SI concise summary and the SI brochure that is available from bipm.org. effective on World Metrology Day 2019 (AD 2019 May 20 Monday), the SI units are now exclusively defined in terms of physical constants of atomic and quantum phenomena. please also visit the worldmetrologyday.org website.
AAT has updated the AAT ICAS standards for the first time since 2011. find the standards documents with the web index of AAT ICAS.
download the AAT ICAS poster for World Metrology Day 2019 featuring AAT ICAS table 2019.1 SI base units, defining constants, and corresponding units.
World Metrology Day 2019
1 page, formatted for A4 letter.
131.83 KiB ≈ 134999 B
browse metric resources for the Metrication Month 2019 announcement and poster.
|aatideas.org web page updated:|
|UCN 12019 S20 Orange ✦ day 140 ✦ IDC zone(UT) t360 tt694|
|2019 day 140 ✦ t360|
|AD 2019 May 20 Monday ✦ SMH UT 08:39:24|