Suppose you walk into a sauna that has an ambient temperature of 50.0oC . (a) Calculate the rate of heat transfer to you by radiation given your skin temperature is 37.0oC , the emissivity of skin is 0.98, and the surface area of your body is 1.50 m2 . (b) If all other forms of heat transfer are balanced (the net heat transfer is zero), at what 554 Chapter 14 | Heat and Heat Transfer Methods rate will your body temperature increase if your mass is 75.0Kg
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
Suppose you walk into a sauna that has an ambient temperature of 50.0oC . (a) Calculate the
37.0oC , the emissivity of skin is 0.98, and the surface area
of your body is 1.50 m2 . (b) If all other forms of heat transfer are balanced (the net heat transfer is zero), at what
554
Chapter 14 | Heat and Heat Transfer Methods
rate will your body temperature increase if your mass is 75.0Kg
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