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Wikipedia definition
1. Technical atmosphereA technical atmosphere is a non-SI unit of pressure equal to one kilogram-force per square centimeter. The symbol "at" clashes with that of the katal, the SI unit of catalytic activity; a kilotechnical atmosphere would have the symbol "kat", indistinguishable from the symbol for the 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, the picogram.
Read “Technical atmosphere” on English Wikipedia
Read “工学気圧” on Japanese Wikipedia
Read “Technical atmosphere” on DBpedia

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