A
technical atmosphere (symbol: at) is a non-
SI unit of
pressure equal to 1
kilogram-force per square centimeter, i.e. 98.0665
kilopascals (kPa) or about 0.967 84 ''standard
atmospheres''.
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 the katal.