As a coffee enthusiast, you wish to keep your coffee as hot as possible for as long as possible. You wish to find the rate of heat loss of a typical coffee mug. Assume the mug to be a cylinder that has a lid made out of the same material as the rest of the cylinder and that the thickness of the walls is 1.34 cm. Assume that the thermal conductivity of all sides of the mug is 0.942 W/m-C, that the mug has an emissivity of 0.730, and that the Stefan-Boltzmann Constant is 5.67 x 10-8 W/m?-K“. If the coffee in the mug is 83.4 °C and the room temperature is 24.8 °C, how much more heat does the mug lose through conduction than from radiated energy? The mug loses heat by conduction times more quickly than by radiation
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.
thickness of wall =1.34cm
Thermal conductivity of mug is = 0.943 W/m-C
emissivity= 0.73
Boltzmann's constant =5.67×10-8w/m2.k4
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