The size of spherical aerobic bacteria is limited by the rate at which oxygen diffuses through water. a bacterium with a radius greater than roughly 10 μm is not able to obtain enough oxygen from the surrounding water to sustain itself. given that the diffusion constant of oxygen in water is 8 ×10−10 m2s-1, how long does it take oxygen in water to diffuse an rms distance of 10 μm?
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