IPIQ

PHYSICS

G01

MEASURING; TESTING

G01N

INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

9/00

Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity

G01N9/002

using variation of the resonant frequency of an element vibrating in contact with the material submitted to analysis

G01N2009/004

comparing frequencies of two elements