at - Technical Atmosphere Pressure Unit

Technical Atmosphere is similar although not the same value as the Standard Atmosphere pressure unit (atm) and both have been used historically to relate a pressure value to multiples of atmospheric pressure. 1 Technical Atmosphere is defined as being exactly equal to 98,066.5 Pascals.

The at pressure unit can be occasionally found on water resistant watches to indicate the maximum depth rating, particularly on European brands. However the unit has been largely phased out and the average atmospheric pressure is now mostly defined as 1 atm (101325 Pa) for weather and aviation or more 1 bar (100,000 Pa) for industry and general purposes.

Technical Atmosphere is some times written as 'ata' which is the short way of writing 'at absolute'.

Equivalent values for 1 at in other pressure units can be found in the list below.

To convert any pressure unit into Technical Atmospheres click on the relevant unit below.

Use the pressure converter page to convert many different values to and from technical atmosphere units.

at Pressure Conversion Factors

0.980665	bar
14.2233	psi
980.665	mbar
98066.5	N/m²
98066.5	Pa
980.665	hPa
98.0665	kPa
0.0980665	MPa
1	kg/cm²
10000	mmH2O 4°C (39.2°F)
1000	cmH2O 4°C (39.2°F)
10	mH2O 4°C (39.2°F)
393.701	inH2O 4°C (39.2°F)
32.8084	ftH2O 4°C (39.2°F)
735.559	mmHg 0°C (32°F)
73.5559	cmHg 0°C (32°F)
28.9590	inHg 0°C (32°F)
735.559	Torr
735559	mTorr
0.96784	atm
1	at
980665	dyn/cm²
227.573	oz/in²
735559	µHg 0°C (32°F)
0.00634971	tsi (uk, long)
0.00711167	tsi (usa, short)
1.02408	tsf (usa, short)
2048.16	psf
1000	g/cm²