A mountain climber wears a goose-down jacket 3.5 cm thickwith total surface area 0.95m2 The temperature at thesurface of the clothing is –18°C and at the skin is 34°C.Determine the rate of heat flow by conduction through thejacket assuming (a) it is dry and the thermal conductivity k isthat of goose down, and (b) the jacket is wet, so k is thatof water and the jacket has matted to 0.50 cm thickness.
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 mountain climber wears a goose-down jacket 3.5 cm thick
with total surface area 0.95m2 The temperature at the
surface of the clothing is –18°C and at the skin is 34°C.
Determine the rate of heat flow by
jacket assuming (a) it is dry and the thermal conductivity k is
that of goose down, and (b) the jacket is wet, so k is that
of water and the jacket has matted to 0.50 cm thickness.
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