Just thermodynamics? One of the most challenging areas of applied science, calibration-wise.
Last time I checked Newtonian mechanics had sort of lost its universal heft.
Sighs deeply.
No, Newtonian mechanics is as precise as it always has been for what it works brilliantly for. At the very large scale and the very small scale there are other models that work better, but there's a pretty good understanding of how these are related. None of which are relevant to, for example, sending a rocket into space.
At university we even had lectures on the concordance principle, which is how to understand why quantum phenomena result in what we observe using classical physics (including thermodynamics and Newtonian mechanics).
So, in the context of heating biological material by causing motion of polar molecules by irradiating with microwaves, there's nothing pertinent to learn about the radiative intensities we are all exposed to routinely. We already know that the induced motions are negligible compared to the thermal motions that are happening all the time anyway. There is a larger effect on your body when the sun comes out from behind a cloud.