The maximum temperature in the metal is 800 F and the minimum temperature in the insulation is 20 F. The amount of heat lost to the ambient is 20 Btu/ft2.
What is temperature?
The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points or thermometric substances. The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), as well as the Kelvin scale (K), with the latter being mostly used for scientific purposes. One of the seven base units inside the International System of Units is the kelvin (SI). The lowest temperature just on thermodynamic temperature scale is absolute zero, or 0 kelvin, or 273.15 °C. The third thermodynamic law acknowledges that it cannot actually be reached experimentally but can only be very closely approached.
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