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Diffusionskoeffizient m
astr.	coefficient de diffusion atmosphérique (der Atmosphäre)
chem.	diffusivité f
earth.sc., mech.eng.	coefficient de diffusion
el.	constante de diffusion
environ., chem.	coefficient de diffusion D

Diffusionskoeffizient: 6 phrases in 4 subjects

Earth sciences	1
Electronics	2
General	2
Superconductivity	1