View source for Physics:ISO 31-2

{{Use British (Oxford) English|date=January 2012}}

'''ISO 31-2''' is the part of [[International standard|international standard]] [[Physics:ISO 31|ISO 31]] that defines names and symbols for [[Physics:Physical quantity|quantities]] and units related to ''periodic and related phenomena''.

Its definitions include:

{| class="wikitable"
! colspan="2" | Quantity
! colspan="3" | Unit
! rowspan="2" width="25%"| Remarks
|-
!Name||Symbol|||Name||Symbol||Definition
|-
|period, periodic time||''T''||[[Second|second]]||s||
|-
|time constant of an exponentially varying quantity||τ||second||s||
|}

{{ISO standards}}
[[Category:Units of time]]

{{Unreferenced|date=2021}}
{{Sourceattribution|ISO 31-2}}