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Diffusionskoeffizient m
chem., el.	coeficiente de difusão do centro de massa; difusibilidade
earth.sc., mech.eng.	coeficiente de difusão
el.	constante de difusão
environ., chem.	coeficiente de difusão D

Diffusionskoeffizient: 4 phrases in 3 subjects

Earth sciences	1
Electronics	2
Superconductivity	1