Abstract
Diffusion is – for the purpose of this book – the random motion of water molecules in fluid water. When water is frozen, the particles stand still, but when water is liquid, the water molecules move around owing to their thermal energy. They do so rather quickly, at about 1,000 m/s. This above-racing-car speed, however, does not convert into a high-speed, long-distance distribution of the molecules, because they bounce at each other very frequently: The time between bounces is about 1/1,000,000,000,000 s only.
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Stieltjes, B., Brunner, R., Fritzsche, K., Laun, F. (2013). Introduction to Diffusion Imaging. In: Diffusion Tensor Imaging. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20456-2_1
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