Example The figure below shows the cross section of a wall made of pine of thickness La and brick of thickness Ld (= 2La), sandwiching two layers of unknown material with identical thickness and thermal conductivity. The thermal conductivity of the pine is ka and that of the brick is kd (=5ka). The face area A of the wall is unknown. Thermal conduction through the wall has reached the steady state; the only known interface temperatures are T1 = 25°C, T2 = 20°C, and T5-10°C. What is interface temperature T4? Ti T Indoors ka T3 (a) k₂ 14- (b) ke (c) (d) -T, Outdoors
Kinetic Theory of Gas
The Kinetic Theory of gases is a classical model of gases, according to which gases are composed of molecules/particles that are in random motion. While undergoing this random motion, kinetic energy in molecules can assume random velocity across all directions. It also says that the constituent particles/molecules undergo elastic collision, which means that the total kinetic energy remains constant before and after the collision. The average kinetic energy of the particles also determines the pressure of the gas.
P-V Diagram
A P-V diagram is a very important tool of the branch of physics known as thermodynamics, which is used to analyze the working and hence the efficiency of thermodynamic engines. As the name suggests, it is used to measure the changes in pressure (P) and volume (V) corresponding to the thermodynamic system under study. The P-V diagram is used as an indicator diagram to control the given thermodynamic system.
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