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Heat and Thermodynamics by Anandamoy Manna

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4.7 The Transport Phenomena

From the standpoint of kinetic theory, we have till now considered a mass of a gas to be in a steady state of homogeneity without any mass motion or motion as a whole. A moving molecule of the gas carries with it mass, momentum and kinetic energy from one region to another. In the steady state, an equal amount of these properties are carried in the opposite direction by another molecule so that on the average, the distribution of these properties is the same at every point in the volume of the gas. Any disturbance of the state of homogeneity due to variation of temperature, pressure and concentration, etc. is always accompanied by transport of the above-mentioned physical properties in a definite direction. We shall ...

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