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Technical Atmosphere

The unit for $\textit{Technical Atmosphere}$, symbol: $at$, is a non-SI unit of pressure equal to one kilogram-force per square centimeter. The symbol $at$ clashes with that of the katal (symbol: $kat$), the SI unit of catalytic activity; a kilotechnical atmosphere would have the symbol $kat$, indistinguishable from the symbol for katal. It also clashes with that of the non-SI unit, the $attotonne$, but that unit would be more likely be rendered as the equivalent SI unit. Assay ton (abbreviation $AT$) is not a unit of measurement, but a standard quantity used in assaying ores of precious metals; it is $29 1D6 \,grams$ (short assay ton) or $32 2D3 \,grams$ (long assay ton), the amount which bears the same ratio to a milligram as a short or long ton bears to a troy ounce. In other words, the number of milligrams of a particular metal found in a sample of this size gives the number of troy ounces contained in a short or long ton of ore.

98066.5

9.80665E4

0112/2///62720#UAA321

http://en.wikipedia.org/wiki/Technical_atmosphere

https://cdd.iec.ch/cdd/iec62720/iec62720.nsf/Units/0112-2---62720%23UAA321

$1 at = 98.0665 kPa \approx 0.96784 standard atmospheres$

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