Compare the rates of loss of thermal energy from a test cell through a sapphire window consisting of a single pane of thickness 5 mm with that through a double-glazed window of the same area made of two sheets of 2 mm thick sapphire, separated by a 5 mm gap containing still air. The internal cell temperature is 931.73 °F and the external. temperature is 31.73 °F. The thermal conductivities of sapphire and air are respectively 40 Wm-K and 2.5x102 Wm-'K:
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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