Technical atmosphere

A technical atmosphere (symbol: at) is a non-SI unit of pressure equal to one kilogram-force per square centimeter.

1 at	= 98.0665 kPa
	≈ 0.96784 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. 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.

Pressure units

	pascal	bar	technical atmosphere	standard atmosphere	torr	pound per square inch
	Pa	bar	at	atm	Torr	psi
1 Pa	≡ 1 N/m2	10−5	1.0197×10−5	9.8692×10−6	7.5006×10−3	145.04×10−6
1 bar	105	≡ 106 dyn/cm2	1.0197	0.98692	750.06	14.5037744
1 at	0.980665 ×105	0.980665	≡ 1 kp/cm2	0.96784	735.56	14.223
1 atm	1.01325 ×105	1.01325	1.0332	≡ p0	760	14.696
1 Torr	133.322	1.3332×10−3	1.3595×10−3	1.3158×10−3	= 1 mmHg	19.337×10−3
1 psi	6.895×103	68.948×10−3	70.307×10−3	68.046×10−3	51.715	≡ 1 lbF/in2

External links

• NIST Guide for the Use of the International System of Units (SI), Appendix B: Conversion Factors