Diffusive Constant
#Physics
$\displaystyle D=\frac{\delta ^{2}}{2\tau}$
- Diffusive constant
- Essentially tells you how quickly something diffuses
- $\displaystyle \tau$ is the time per step
- Has units of $\displaystyle \mathrm{\frac{m^{2}}{s}}$
| Molecule | $\displaystyle D$ in $\displaystyle \ce{H_{2}O}$ at $\displaystyle 25^\circ \mathrm{C,(cm^{2}/s)}$ |
|---|---|
| $\displaystyle \ce{CO_{2}}$ | $\displaystyle 1.9\cdot 10^{-5}$ |
| $\displaystyle \ce{O_{2}}$ | $\displaystyle 2.1\cdot 10^{-5}$ |
| Protein | $\displaystyle 10^{-6}$ |
| Protein in lipid | $\displaystyle 10^{-8}$ |
| Protein in cell | $\displaystyle 10^{-7}$ |