A thermally well insulated, frictionless piston with initial volume V. contains 2.0 moles of an ideal gas. The temperature of the system at all time is T K. Then the piston is pulled until the volume of the gas is doubled. This expansion process is a reversible process. (a) Do the gas velocity distribution and internal energy of the gas change by the expansion? Justify your answer. (b) Determine the change in entropy of the gas.

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.