The diffusion coefficient of hydrogen in steel is given as a function of temperature as $$ D_{A B}=1.65 \times 10^{-6} \exp (-4630 / T)\left(\mathrm{m}^{2} / \mathrm{s}\right) $$ where \(T\) is in \(\mathrm{K}\). Determine the diffusion coefficients at \(200 \mathrm{~K}\), \(500 \mathrm{~K}, 1000 \mathrm{~K}\), and \(1500 \mathrm{~K}\).

Question: Calculate the diffusion coefficients of hydrogen in steel using the equation $D_{A B}=1.65 \times 10^{-6} \exp (-4630 / T)\left(\mathrm{m}^{2} / \mathrm{s}\right)$ at the following temperatures: 200 K, 500 K, 1000 K, and 1500 K. Answer: To find the diffusion coefficients, plug in the given temperature values into the equation and calculate the resulting values. The calculated diffusion coefficients are as follows: - At 200 K: $D_{A B}(200K)=__\,\,\left(\mathrm{m}^{2} / \mathrm{s}\right)$ - At 500 K: $D_{A B}(500K)=__\,\,\left(\mathrm{m}^{2} / \mathrm{s}\right)$ - At 1000 K: $D_{A B}(1000K)=__\,\,\left(\mathrm{m}^{2} / \mathrm{s}\right)$ - At 1500 K: $D_{A B}(1500K)=__\,\,\left(\mathrm{m}^{2} / \mathrm{s}\right)$