Pressurization of mostly liquid media is less common than gas compression (used in hydrogenation or carbonylation reactions, for example). In fact, the pressure range considered goes far beyond what is usually understood by "high pressure", since it ranges from 2 to 20 kbars.
The SI unit of pressure is the pascal :
but bar is also commonly used:
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(1) - VAN ELDIK (R.), HUBBARD (C.D.). -
Chemistry under extreme or non-classical conditions
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(Chimie en conditions extrêmes ou inusuelles). – Wiley, 555 p. (1997).
(2) - ROENTGEN (W.) -
Kurze Mittheilung...
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