ISO 31-2

ISO 31-2 was the part of international standard ISO 31 that defines names and symbols for quantities and units related to periodic and related phenomena. The ISO 31 series has since been replaced with the ISO 80000 series, and the definitions of quantities and units related to periodic and related phenomena have been merged into ISO 80000-3 space and time.[1]

Its definitions include:

Quantity Unit Remarks
Name Symbol Name Symbol Definition
period, periodic time T second s
time constant of an exponentially varying quantity τ second s

References[edit]

  1. ^ "ISO 80000-3:2019(en) Quantities and units – Part 3: Space and time". International Organization for Standardization. Retrieved 2019-10-23.