Add textile units

[keilw]

I looked at the codes so far and found nothing for the textile industry. Working in Egypt at the moment, I learned, a unit called "Thread Count" was the officially used one by the industry, but the SI has its own unit called "tex".

At least that one, maybe also commonly used and still alive units should be added. If UCUM aims at supporting B2B in industries producing Cotton and other textiles, still a big industry in the US AFAIK, rather than supporting mainly one of the largest consumers of cotton (healthcare ;-) I belive this should be added.

See http://en.wikipedia.org/wiki/Units_of_textile_measurement

[keilw]

The actual unit I came across is named "TPI" in Wikipedia. As it looks like even Industry Standard Organizations and US Trade Officials have spent effort on this, adding it to UCUM seems like a good sign. Probably consulting them, too.

[gschadow]

As always, requests for new units should come with references.

I would bet a lot that SI does not have a unit called "tex" or I would at least be very surprized.

TPI is as useless a unit as GPF. It's just 1/in. We do not have a unit DPI either. Because a thread or a dot or a flush are not physical quantities. We also don't have RPMs, we have 1/min.

[keilw]

I guess it's probably best to get the textile industry involved where necessary.

The reference for where those units are quoted points to Wikipedia. That URL literally quotes tex to be a "SI" unit, but it may only mean the "most official" or international one, not being part of the SI catalogue.