A kilogramforce per centimetre square (kgf/cm^{2}), often just kilogram per square centimetre (kg/cm^{2}), or kilopond per centimetre square is a deprecated unit of pressure using metric units. It is not a part of the International System of Units (SI), the modern metric system. 1 kgf/cm^{2} equals 98.0665 kPa (kilopascals). It is also known as a technical atmosphere (symbol: at).^{[1]}^{[2]}
The kilogramforce per square centimetre remains active as a measurement of force primarily due to older pressure measurement devices still in use.
This use of the unit of pressure provides an intuitive understanding for how a body's mass can apply force to a scale's surface area i.e.kilogramforce per square (centi)metre.
In SI units, the unit is converted to the SI derived unit pascal (Pa), which is defined as one newton per square metre (N/m^{2}). A newton is equal to 1 kg⋅m/s^{2}, and a kilogramforce is 9.80665 N,^{[3]} meaning that 1 kgf/cm^{2} equals 98.0665 kilopascals (kPa).
In some older publications, kilogramforce per square centimetre is abbreviated ksc instead of kg/cm^{2}.
Pascal  Bar  Technical atmosphere  Standard atmosphere  Torr  Pound per square inch  

(Pa)  (bar)  (at)  (atm)  (Torr)  (lbf/in^{2})  
1 Pa  1 Pa ≡ 1 Pa  1 Pa = 10^{−5} bar  1 Pa = 1.0197×10^{−5} at  1 Pa = 9.8692×10^{−6} atm  1 Pa = 7.5006×10^{−3} Torr  1 Pa = 0.000 145 037 737 730 lbf/in^{2} 
1 bar  10^{5}  ≡ 100 kPa
≡ 10^{6} dyn/cm^{2} 
= 1.0197  = 0.98692  = 750.06  = 14.503 773 773 022 
1 at  98066.5  0.980665  ≡ 1 kgf/cm^{2}  0.967 841 105 354 1  735.559 240 1  14.223 343 307 120 3 
1 atm  ≡ 101325  ≡ 1.01325  1.0332  1  760  14.695 948 775 514 2 
1 Torr  133.322 368 421  0.001 333 224  0.001 359 51  1/760 ≈ 0.001 315 789  1 Torr
≈ 1 mmHg 
0.019 336 775 
1 lbf/in^{2}  6894.757 293 168  0.068 947 573  0.070 306 958  0.068 045 964  51.714 932 572  ≡ 1 lbf/in^{2} 
1 at = 98.0665 kPa ≈ 0.96784 standard atmospheres
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Transcription
Ambiguity of at
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. It also clashes with that of the nonSI unit, the attotonne, but that unit would be more likely be rendered as the equivalent SI unit, the picogram.
References
 ^ Dorf, Richard C. (20031124). CRC Handbook of Engineering Tables. CRC Press. ISBN 9780203009222.
 ^ Suplee, Curt (20090702). "Special Publication 811". NIST. Retrieved 20190517.
 ^ The NIST Guide for the use of the International System of Units, National Institute of Standards and Technology, 18 Oct 2011