3 ms·

Independent of mobile phones and treating SAR as the electromagnetic phenomenon it actually is, hell yes. This is what ultimately limits certain types of MRI e

Independent of mobile phones and treating SAR as the electromagnetic phenomenon it actually is, hell yes. This is what ultimately limits certain types of MRI experiment -- you don't want to cook the patient. The details are complex and involve solving Maxwells equations, and optionally the bio heat equation to model blood flow. There are plenty of examples of cooking things with large amounts of RF/mmWaves. The physics is very well understood. For some specific examples, have a look at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3469254/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3469254/, which talks about fields burning the inside of brains, or https://www.ajnr.org/content/34/5/E47 https://www.ajnr.org/content/34/5/E47, in which an unfortunate girl was burnt by her (silver containing) bra. Are there any documented cases of a mobile phone causing problems? I don't know of any offhand, but SAR is real and the models that predict it very well validated.

EdwardDiego 3y ago
Yep, high power RF can cook you, it's why radio engineers try not to expose their crotch or head to focused microwave transmitters when climbing a tower. But these are signal sources of a far higher power output than a cellphone.
josephcsible 3y ago
Obviously sticking your head in a running microwave oven or something like that would be bad for you. But using that to say the SAR values from cell phones are dangerous would be like saying that warm water is more dangerous than cold water since boiling water is known to be dangerous. So let me clarify my original question: is there any evidence of actual harm at the highest SAR values of any cell phone?
- azalemeth 3y ago
  Using your analogy, it's more like saying that we know water above 40 degrees will be progressively more likely to cause a burn, so the limit of average heating of a cellphone is 20 degrees. > So let me clarify my original question: is there any evidence of actual harm at the highest SAR values of any cell phone? I don't think there is any.

EdwardDiego 3y ago

Yep, high power RF can cook you, it's why radio engineers try not to expose their crotch or head to focused microwave transmitters when climbing a tower. But these are signal sources of a far higher power output than a cellphone.

josephcsible 3y ago

Obviously sticking your head in a running microwave oven or something like that would be bad for you. But using that to say the SAR values from cell phones are dangerous would be like saying that warm water is more dangerous than cold water since boiling water is known to be dangerous. So let me clarify my original question: is there any evidence of actual harm at the highest SAR values of any cell phone?

azalemeth 3y ago
Using your analogy, it's more like saying that we know water above 40 degrees will be progressively more likely to cause a burn, so the limit of average heating of a cellphone is 20 degrees. > So let me clarify my original question: is there any evidence of actual harm at the highest SAR values of any cell phone? I don't think there is any.