Technical atmosphere

The Technical atmosphere is a non- SI unit of pressure -compliant She's since January 1, 1978 in Germany not permitted for the indication of the pressure and was replaced by Pascal. The unit symbol is AT.

Etymology

The term derives from the Greek ἀτμός atmosphere ( Atmos ) = vapor, mist, breath and σφαῖρα ( sphaira ) = Ball ( Latinized SPHAERA ) ago.

Definition

The Technical atmosphere was standardized as the amount of pressure that caused 10 meters of water.

1 at: = 10 m wg = 1 kp / cm ² = 9.80665 N / cm ² = 0.980665 bar = 98066.5 Pa

Derived units

Depending on the reference level of the following units derived from the Technical Atmosphere:

• Absolute pressure ( reference level: 0): ata ( pa)
• Pressure in at above the reference level: atm ( PSIG )

Atm

The old unit atm ( for " Technical atmospheres above reference level " ) found, for example, on the Reifendruckfüllgeräten at petrol stations. Since the car tires can only support the vehicle when the tire in relation to the ambient pressure (about 1 bar) overpressure includes the Reifendruckfüllgeräte only show the pressure ( atm ). If the tires filled with 2.2 atm, the absolute pressure in the tire is at 2.2 1.0 at, so therefore about 3.2 bar.