A fire walker runs across a bed of hot coals without sustaining burns. In this problem, you may assume the body temperature of a human is a constant 37.0°C. (a) Calculate the heat heat, in joules, transferred by conduction into the sole of one foot of a firewalker, given that the bottom of the foot is a 2.9-mm-thick callus, with a conductivity at the lowest end of the range for wood and with a density of 295 kg/m3. The area of contact is 23 cm2, the temperature of the coals is 700°C, and the time in contact is 1.05 s. The firewalker’s body temperature is 37°C. (b) What temperature increase, in degrees Celsius, is produced in the 23 cm3 of tissue affected? The specific heat of human tissue is typically 3500 J/(kg⋅°C).
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.
A fire walker runs across a bed of hot coals without sustaining burns. In this problem, you may assume the body temperature of a human is a constant 37.0°C.
(a) Calculate the heat heat, in joules, transferred by
(b) What temperature increase, in degrees Celsius, is produced in the 23 cm3 of tissue affected? The specific heat of human tissue is typically 3500 J/(kg⋅°C).
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