Rate of Temperature Change with Five Pot and Pan Materials according to Bottom Thickness The rate of temperature change during the processes of heating and air cooling was studied for pots and pans in five different materials with varying bottom thickness. Although the shape and sizes of the pots and pans have differed, remarkable correlation has been observed between the rate of temperature change and bottom thickness, as well as with such thermophysical properties of the materials as the thermal conductivity, specific heat capacity and thermal diffusivity.
The rate of temperature rise during heating decreased with increasing botto m thickness, and did the rate of temperature drop during air cooling. Thick pans took 2 to 5 times longer to heat than thin pans. The rate of temperature rise for pots and pans made from Al-alloy and Cu materials, which have high thermal conductivity, was lower than the rate of temperature drop. On the other hand, the rate of temperature drop was lower than that of temperature rise for the pots and pans in carbon steel, stainless steel and heat-resisting glass materials which have relatively low thermal conductivity. The rate of external temperature rise for the Al-alloy and Cu materials detected at heater outside was much higher than that for the carbon steel, stainless steel and heat-resisting glass materials, while the difference in temperature for the Al-alloy and Cu materials between the heater inside and outside was much smaller than that for the carbon steel, stainless steel and heat-resisting glass materials.