DIFF Subgroup
G01N 9/26 by measuring pressure differences
Introduced: September 1968
Full Title
Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity > by measuring pressure differences
CPC subdivides this area 3x more granularly than IPC with 2 additional codes.
2 codes are CPC-only extensions.
Note: 1 CPC extensions are marked as secondary classification only.
Child Classifications
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- G01N 9/28 by measuring the blowing pressure of gas bubbles escaping from nozzles at different depths in a liquid IPC+CPC Available in IPC and CPC