# Title udunits supports ppm, but documentation states it does not # Moderator None at the moment
# Requirement Summary The documentation states that udunits does not support dimensionless ratios like parts-per-million. But udunits does support such units. # Technical Proposal Summary Change sentence to state that ppm, ppb etc are supported, or at least remove the statement that these units are not supported. # Benefits Every reader working with dimensionless ratios will benefit from the correction. # Status Quo The current working draft (1.9) states that ppm etc. are not supported by udunits. # Detailed Proposal The chapter "Description of the Data" - "Units" (ch03.adoc) states: > The Udunits package defines a few dimensionless units, such as `percent`, but > is lacking commonly used units such as ppm (parts per million). The last part is wrong. UDUNITS-2 does support ppm, ppb, ppt, and ppq. In addition, percent is also supported. Other similar units, like permille are not supported. In fact, these units were supported since udunits2 version 2.1.24 from August 2011. The change occurred here: https://github.com/Unidata/UDUNITS-2/commit/789147fd3b2e4714e27cd198040ea114ac503861 Please update the documentation to reflect the support of ppm etc. -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/cf-convention/cf-conventions/issues/260 This list forwards relevant notifications from Github. It is distinct from [email protected], although if you do nothing, a subscription to the UCAR list will result in a subscription to this list. To unsubscribe from this list only, send a message to [email protected].
