Please explain ATA.

1,0 ATA = 1,01325 bara or 29,92"Hg (absolute)

Soviet/Russia uses mmHg (also called Torr) where 1,0 ATA equals 760 mmHg

ATA and Bara is absolute pressure

ATG and Barg is gauge pressure

Todays standard pressure unit is Pa where mBar and hPa gives the same values i.e 1013,25 mBar = 1013,25 hPa.

Since we talk Manifold pressure, this pressure is then AFTER the Supercharger.

I think 1 ata refers to 1kg/cm2 (kilogram of force per square centimeter) pressure unit from metric system old one before Pa.

I think there is a 4th way. Turbocharger. And it looks like far better solution to any mechanical driven supercharger.

(Soviet AM-35 type engines, Jumo-213).

Which of this 2 was first ?

ATA and Kg/cm2 are not the same.

Kg/cm2 is normally used as a gauge measurement (relative and NOT absolute), but I think You could say Kg/cm2 abs.

Kg/cm2 is not used today, and the time where it was used, it was more common to use Kg/cm2 for positive pressure and Torr for negative (vacuum).

Low pressure where often measured in mmH2O, mmHg, InH2O or InHg, but today Pa, hPa, KPa and MPa is the standard, but mBar and Bar together with PSI are also widely used.

1,0 ATA equals 1,03323 Kg/cm2 absolute and equals 1,01325 Bara

1,0 bar equals 1,0197 Kg/cm2

ATA and Kg/cm2 are not the same.

 

Kg/cm2 is normally used as a gauge measurement (relative and NOT absolute), but I think You could say Kg/cm2 abs.

 

Kg/cm2 is not used today, and the time where it was used, it was more common to use Kg/cm2 for positive pressure and Torr for negative (vacuum).

 

Low pressure where often measured in mmH2O, mmHg, InH2O or InHg, but today Pa, hPa, KPa and MPa is the standard, but mBar and Bar together with PSI are also widely used.

 

 

1,0 ATA equals 1,03323 Kg/cm2 absolute and equals 1,01325 Bara

1,0 bar equals 1,0197 Kg/cm2

I think this is way to precisecomplicated.

Why not 1 ata = 1kg/cm2 that would be way much easier.

I meant three ways of no waisting. :)

Oh, sorry then.

I think this is way to precisecomplicated.

Why not 1 ata = 1kg/cm2 that would be way much easier.

It was not meant to overcomplicate things.

But we shouldn´t mix apple and pears.

The OP asked what ATA is and ATA is not Kg/cm2.

But Your right - they are close. Bara, which is a better known unit, is even closer.

It was not meant to overcomplicate things.

But we shouldn´t mix apple and pears.

 

The OP asked what ATA is and ATA is not Kg/cm2.

But Your right - they are close. Bara, which is a better known unit, is even closer.

ATA is 1kg/cm2

Japaneeze system was a hybrid - as Russian system operates with absolute mmHg, Japaneeze used 76 cm as zero and thus had +- boost values like English.

Good to know

I think there is a 4th way. Turbocharger. And it looks like far better solution to any mechanical driven supercharger.

Depends on what you consider better. It has to have an exhaust turbine that runs very hot, and it has to reach very high speeds. So, it's a much more finicky and expensive piece of equipment. It's only major advantage is it doesn't absorb crankshaft power--so it performs better at high altitude.

The shaft driven blower was reliable and straightforward, and served well up to the end of the war, though.

AD

I am seeing the terms mass and force being mixed up, as well as the difference between quantities and units.

"ata" is a German abbreviation which stands for "Atmosphäre, absolute".

It is a quantity (not unit) describing absolute pressure (= force per unit area). Note, pressure is force (not mass) per unit area.

In comparison, the "atü" ("Atmosphäre, über") is a quantity describing relative pressure compared to, for example, the surrounding amosphere.

The "at" (Atmosphäre) is a unit (not quantity) of pressure. It is currently defined as 9.80665 N/cm�² = 0.980665 bar.

However, the original definition of "at" (at, not ata) was 1 at = 10 mWS (mWS = Meter Wassersäule). In other words, it the absolute pressure of a 10-metre column of water. Technically, it is 10 mWS is 1 kp (kilopond) per square centimetre.

Whenever someone uses kg/cm�² to describe pressure, it is not technically correct (as it is using mass per area, not force per area). It is based on the assumption that 1kg = 9.8N, which might be true at rest on the Earth's surface, but would not apply, for example, on the Lunar surface.

The unit "at" (and thus quantity, "ata") was deprecated in Germany from 1978 in favour of the strict SI unit, namely, Pa (Pascal) = N/m�².

Ref: https://de.wikipedia.org/wiki/Druck_(Physik)

Sorry for being a pedanticist.

No body is missing anything here. This is how pressure unit looked back in old times.

1ATA = 1kg/cm2= 1kgf/cm2

It does not matter what unit is it. Pressure sensor is not based on earth gravity, it wont affect pressure reading.

No body is missing anything here. This is how pressure unit looked back in old times.

1ATA = 1kg/cm2= 1kgf/cm2

It does not matter what unit is it.

The "old times" German unit was 1at = 10 mWS (REF1, REF2). That is a unit of pressure. Dimensionally (REF3), this is F.L-2 = M.L-1.T2.

1kg/cm2, dimensionally, is M.L-2. This is not the same as M.L-1.T2. I concede that it is commonly used incorrectly.

Pressure sensor is not based on earth gravity, it wont affect pressure reading.

I agree with you completely on this point.

= kG/cm2 = kgf/cm2