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
	≈ 6999967840000000000♠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	Pounds per square inch
	(Pa)	(bar)	(at)	(atm)	(Torr)	(psi)
1 Pa	≡ 1 N/m²	10⁻⁵	6995101970000000000♠1.0197×10⁻⁵	6994986919999999999♠9.8692×10⁻⁶	6997750060000000000♠7.5006×10⁻³	6996145037700000000♠1.450377×10⁻⁴
1 bar	10⁵	≡ 100 kPa ≡ 10⁶ dyn/cm²	7000101970000000000♠1.0197	6999986920000000000♠0.98692	7002750060000000000♠750.06	7001145037700000000♠14.50377
1 at	7004980665000000000♠9.80665×10⁴	6999980665000000000♠0.980665	≡ 1 kp/cm²	6999967841100000000♠0.9678411	7002735559200000000♠735.5592	7001142233400000000♠14.22334
1 atm	7005101325000000000♠1.01325×10⁵	7000101325000000000♠1.01325	7000103319999999999♠1.0332	1	≡ 7002760000000000000♠760	7001146959500000000♠14.69595
1 Torr	7002133322399999999♠133.3224	6997133322400000000♠1.333224×10⁻³	6997135955100000000♠1.359551×10⁻³	≡ 1/760 ≈ 6997131578900000000♠1.315789×10⁻³	≡ 1 Torr ≈ 1 mm_Hg	6998193367800000000♠1.933678×10⁻²
1 psi	7003689480000000000♠6.8948×10³	6998689480000000000♠6.8948×10⁻²	6998703069000000000♠7.03069×10⁻²	6998680460000000000♠6.8046×10⁻²	7001517149300000000♠51.71493	≡ 1 lbf /in²

External links

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

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