
More evenly than what?
I have no idea why people say cast iron frying pans heat evenly. They heat very unevenly due to the laws of physics.
Just how unevenly? I just did an experiment to find out with real numbers. I greased down my 12 inch cast iron pan with a light coat of clarified butter and heated it until I noticed that it was smoking. Then I took some readings with my infrared thermometer.
It was just 361 degrees on the cooking surface close to the edge and 548 degrees in the middle.
That's a 187 degree difference.
Sorry, but I'm NOT going to heat my beloved expensive 12 inch stainless steel pan to 548 degrees for a comparison.