# Ohms law hold till what temp?

Is the Ohm's law verified to hold true at all temperatures? If not, then till what temperature does the Ohm's law hold?

I think it is valid only till $0$ K and above. Am I right in my thinking?

• Ohm's law is valid for Ohmic devices. – Yashas May 13 '17 at 2:39
• I think you can look for when the material has convection and diffusion. I think Ohm's law stops being valid when velocity dependent terms or terms involving the gradient of the number density becomes comparable to the terms proportional to the electric field. Ohmic devices have convection and diffusion that doesnt depend on electromagnetic fields. (I read something like that in Alan J. Grodzinsky. Fields, Forces, and Flows in Biological Systems. Garland Science, 2011.) – Emil May 13 '17 at 6:39
• ... I read something like that on page 42. The equation looks pretty much like Lorentz force law plus convection plus diffusion. – Emil May 13 '17 at 6:46
• (Or rather Lorentz force law * mobility plus diffusion plus convection. I think the Lorentz-y term was called migration flux.) – Emil May 13 '17 at 6:54
• @Emil I am afraid that I do not have access to the book that you have quoted from but to me convection implies a temperature difference and diffusion a concentration gradient? With the Lorentz force present there must be a magnetic field. – Farcher May 13 '17 at 10:05