decibar
Pressureexact by definition
The decibar is exactly 10⁴ pascals, one tenth of a bar. It is the unit of physical oceanography for a specific and useful reason: a change of one decibar corresponds almost exactly to a change of one metre of depth in seawater, so a pressure profile in decibars can be read directly as a depth profile in metres.
Watch out: The correspondence is a convenient approximation and not a definition. It drifts with latitude, temperature and salinity, and by several thousand metres depth the accumulated difference between decibars and metres is a couple of percent.
| 1 | 10 |
One decibar in every pressure unit
| 100,000 | microbar (μbar) | |
| 100,000 | barye (Ba) | |
| 75,006.2 | millitorr (mTorr) | |
| 10,000 | pascal (Pa) | |
| 1,019.72 | millimeter of water column (mmH₂O) | |
| 208.854 | pound per square foot (lb/ft²) | |
| 101.972 | centimeter of water column (cmH₂O) | |
| 100 | hectopascal (hPa) | |
| 100 | millibar (mbar) | |
| 75.0062 | torr (Torr) | |
| 75.0062 | millimeter of mercury (mmHg) | |
| 40.1463 | inch of water column (in w.g.) | |
| 10 | kilopascal (kPa) | |
| 3.34553 | foot of water column (ft H₂O) | |
| 2.953 | inch of mercury (inHg) | |
| 1.45038 | pound per square inch (psi) | |
| 1.01972 | meter of water column (m H₂O) | |
| 1 | decibar (dbar)this unit | |
| 0.101972 | kilogram-force per square centimeter (kgf/cm²) | |
| 0.1 | bar (bar) | |
| 0.0986923 | atmosphere (atm) | |
| 0.01 | megapascal (MPa) | |
| 0.00145038 | kip per square inch (ksi) | |
| 0.00001 | gigapascal (GPa) | |
| 0.00000145038 | million pounds per square inch (Mpsi) |
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