Fick's law form for diffusion is: V(gas) = AD(P1 - P2)/T. Which option correctly represents this form?

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Fick's law for gas diffusion says the rate of diffusion is proportional to surface area, the diffusion coefficient, and the driving force, which is the difference in partial pressures across the barrier, all divided by the barrier thickness. The form V(gas) = AD(P1 - P2)/T embodies that: larger area and diffusion coefficient boost diffusion, a bigger partial pressure difference (P1 minus P2) increases the rate, and a thicker barrier (T) slows it down because you divide by T. If P1 is greater than P2, the diffusion proceeds in the expected direction and the rate is positive; reversing the gradient would flip the sign. The other variants misrepresent the driving force, add an unnecessary plus, or put thickness in the wrong form (T^2), which would not reflect how diffusion responds to barrier thickness.