A student living in a 4m x 6m x 6m dormitory room turns on her 150-W fan before he leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming that all the doors and windows are tightly closed and disregarding any heat transfer through the walls and and the windows and he comes back 10 hours later, what is the initial pressure of the air in the room? Use specific heat values at room temperature (Cv=0.718 kJ/kg-K), and assume that the room to be at 15 deg C in the morning when he leaves and 58.1 deg C once he comes back. The molecular mass of the air is 29 g/mol.
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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