..60 GO Figure Figure 18-46 shows the cross section of a wall made of three layers. The layer thicknesses are L₁, L2=0.700L₁, and L3=0.350L₁. The thermal conductivities are k₁, k₂ = 0.900k₁, and k3= 0.800k₁. The temperatures at the left side and right side of the wall are TH = 30.0°C and Tc = -15.0°C, respectively. Ther- mal conduction is steady. (a) What is the temperature difference AT₂ across layer 2 (between the left and right sides of the layer)? If k₂ were, instead, equal to 1.1k₁, (b) would the rate at which energy is con- ducted through the wall be greater than, less than, or the same as pre- viously, and (c) what would be the value of AT₂?
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.
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