appreciable compared with Brownian diffusion only for 0.1micron or larger particles inhaled during periods of heavy exercise. Here again, however, deposition of particles exceeding about 1 micron in radius present in the alveoli will be controlled by gravitational settling, which is much stronger than diffusiophoresis for such particles.lt is likely that diffusiophoresis proceeds towards the alveolar walls because of the stronger influence of oxygen diffusion on the particles.
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