IPC Subgroup
G01N 7/1 by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
Introduced: September 1968
Last revised: January 2006
Full Title
Analysing materials by measuring the pressure or volume of a gas or vapour > by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
Classification Context
- Section:
- PHYSICS
- Class:
- MEASURING; TESTING
- Subclass:
- INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
1 direct subcode
Child Classifications
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- G01N 7/12 the diffusion being followed by combustion or catalytic oxidation