A specialized instrument used to measure rates of diffusion in gases, liquids, or solids.
From diffusion + -o- (combining form) + -meter (Greek metron 'measure'). This is a more precise variant of diffusimeter, inserting the connecting vowel -o- to ease pronunciation between roots.
Diffusiometers were crucial in proving Einstein's theory of Brownian motion—scientists could finally measure what Einstein predicted theoretically about how tiny particles jiggle.
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