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Attotorr (aTorr) Unit Definition
The attotorr is a multiple of the unit torr (Torr) for pressure. The International System of Units (SI) defines the prefix atto (a) as a factor of 10-18 or 0.000000000000000001. Per this definition, one attotorr is 10-18 torrs. The attotorr is represented by the symbol aTorr.
SI Multiples
A table of various pressure torr units derived from SI multiples:
Submultiples |
Multiples |
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Scientific Notation |
Value |
Prefix |
Name |
Scientific Notation |
Value |
Prefix |
Name |
10-1 Torr |
0.1 Torr |
Deci (d) | Decitorr (dTorr) | 101 Torr |
10 Torr |
Deca (da) | Decatorr (daTorr) |
10-2 Torr |
0.01 Torr |
Centi (c) | Centitorr (cTorr) | 102 Torr |
100 Torr |
Hecto (h) | Hectotorr (hTorr) |
10-3 Torr |
0.001 Torr |
Milli (m) | Millitorr (mTorr) | 103 Torr |
1000 Torr |
Kilo (k) | Kilotorr (kTorr) |
10-6 Torr |
0.000001 Torr |
Micro (µ) | Microtorr (µTorr) | 106 Torr |
1000000 Torr |
Mega (M) | Megatorr (MTorr) |
10-9 Torr |
0.000000001 Torr |
Nano (n) | Nanotorr (nTorr) | 109 Torr |
1000000000 Torr |
Giga (G) | Gigatorr (GTorr) |
10-12 Torr |
0.000000000001 Torr |
Pico (p) | Picotorr (pTorr) | 1012 Torr |
1000000000000 Torr |
Tera (T) | Teratorr (TTorr) |
10-15 Torr |
0.000000000000001 Torr |
Femto (f) | Femtotorr (fTorr) | 1015 Torr |
1000000000000000 Torr |
Peta (P) | Petatorr (PTorr) |
10-18 Torr |
0.000000000000000001 Torr |
Atto (a) | Attotorr (aTorr) | 1018 Torr |
1000000000000000000 Torr |
Exa (E) | Exatorr (ETorr) |
10-21 Torr |
0.000000000000000000001 Torr |
Zepto (z) | Zeptotorr (zTorr) | 1021 Torr |
1000000000000000000000 Torr |
Zetta (Z) | Zettatorr (ZTorr) |
10-24 Torr |
0.000000000000000000000001 Torr |
Yocto (y) | Yoctotorr (yTorr) | 1024 Torr |
1000000000000000000000000 Torr |
Yotta (Y) | Yottatorr (YTorr) |
10-27 Torr |
0.000000000000000000000000001 Torr |
Ronto (r) | Rontotorr (rTorr) | 1027 Torr |
1000000000000000000000000000 Torr |
Ronna (R) | Ronnatorr (RTorr) |
10-30 Torr |
0.000000000000000000000000000001 Torr |
Quecto (q) | Quectotorr (qTorr) | 1030 Torr |
1000000000000000000000000000000 Torr |
Quetta (Q) | Quettatorr (QTorr) |
Other Pressure Unit Definitions
Atmosphere Standard (atm)
Atmosphere Technical (atm)
- Attobar (abar)
- Attopascal (aPa)
- Attotorr (aTorr)
- Bar (bar)
Barad (Ba)
Barye (Ba)
- Centibar (cbar)
Centihg (cHg)
Centimeter Mercury 0 °C (cm Hg)
Centimeter Water 4 °C (cm H2O)
Centimeter of Mercury 0 °C (cm Hg)
Centimeter of Water 4 °C (cm H2O)
- Centipascal (cPa)
- Centitorr (cTorr)
- Decabar (dabar)
- Decapascal (daPa)
- Decatorr (daTorr)
- Decibar (dbar)
- Decipascal (dPa)
- Decitorr (dTorr)
- Dekabar (dabar)
- Dekapascal (daPa)
- Dekatorr (daTorr)
Dyne (dyn)
- Exabar (Ebar)
- Exapascal (EPa)
- Exatorr (ETorr)
- Femtobar (fbar)
- Femtopascal (fPa)
- Femtotorr (fTorr)
Foot Mercury 0 °C (ft Hg)
Foot Water 4 °C (ft H2O)
Foot of Air 0 °C (ft air)
Foot of Air 15 °C (ft air)
Foot of Head (ft head)
Foot of Mercury 0 °C (ft Hg)
Foot of Water 4 °C (ft H2O)
- Gigabar (Gbar)
- Gigapascal (GPa)
- Gigatorr (GTorr)
- Gram (g)
- Hectobar (hbar)
- Hectopascal (hPa)
- Hectotorr (hTorr)
Inch Water 4 °C (in H2O)
Inch of Air 0 °C (in air)
Inch of Air 15 °C (in air)
Inch of Mercury 0 °C (in Hg)
Inch of Water 4 °C (in H2O)
Inch of Water Column (in wc)
- Kilobar (kbar)
- Kilogram (kg)
Kilogram-Force (kgf)
- Kilonewton (kN)
- Kilopascal (kPa)
Kilopond (kp)
- Kilotorr (kTorr)
Kip (kip)
- Megabar (Mbar)
- Meganewton (MN)
- Megapascal (MPa)
- Megatorr (MTorr)
Meter of Air 0 °C (m air)
Meter of Air 15 °C (m air)
Meter of Head (m head)
- Microbar (μbar)
Micrometer of Mercury 0 °C (μm Hg)
Micrometer of Water 4 °C (μm H2O)
Micron Mercury 0 °C (μm Hg)
Micron of Mercury 0 °C (μm Hg)
- Micropascal (μPa)
- Microtorr (μTorr)
- Millibar (mbar)
Millihg (mHg)
Millimeter Water 4 °C (mm H2O)
Millimeter of Mercury 0 °C (mm Hg)
Millimeter of Water 4 °C (mm H2O)
- Millipascal (mPa)
- Millitorr (mTorr)
- Nanobar (nbar)
- Nanopascal (nPa)
- Nanotorr (nTorr)
- Newton (N)
Ounce (oz)
- Pascal (Pa)
- Petabar (Pbar)
- Petapascal (PPa)
- Petatorr (PTorr)
- Picobar (pbar)
- Picopascal (pPa)
- Picotorr (pTorr)
Pièze (pz)
Pound (lb)
Poundal (pdl)
- Quectobar (qbar)
- Quectopascal (qPa)
- Quectotorr (qTorr)
- Quettabar (Qbar)
- Quettapascal (QPa)
- Quettatorr (QTorr)
- Ronnabar (Rbar)
- Ronnapascal (RPa)
- Ronnatorr (RTorr)
- Rontobar (rbar)
- Rontopascal (rPa)
- Rontotorr (rTorr)
Sthène (sn)
Technical Atmosphere (at)
- Terabar (Tbar)
- Terapascal (TPa)
- Teratorr (TTorr)
Ton (t)
Ton Long (t)
Ton Short (t)
- Torr (Torr)
Water Column Centimeter (wccm)
Water Column Inch (wcin)
Water Column Millimeter (wcmm)
- Yoctobar (ybar)
- Yoctopascal (yPa)
- Yoctotorr (yTorr)
- Yottabar (Ybar)
- Yottapascal (YPa)
- Yottatorr (YTorr)
- Zeptobar (zbar)
- Zeptopascal (zPa)
- Zeptotorr (zTorr)
- Zettabar (Zbar)
- Zettapascal (ZPa)
- Zettatorr (ZTorr)
Convert to Another Pressure Unit
Related Definitions
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Sources
“Torr.” Wikipedia, Wikimedia Foundation, 4 Sept. 2023, en.wikipedia.org/wiki/Torr.