1 kg of AIR at P = 100 kPa is contained in a RIGID TANK made of IRON of mass 0.5 kg. Initially, the temperature of both the AIR and the TANK are 25°C. [a) Now, the TANK (air and the iron) is heated by an electric heater of power 100 W for 30 min. Calculate the entropy generation Sgen during the heating process. (Heat loss to the surrounding is prevented during this process.) b) Next, the tank is left to cool down in a VERY BIG room at T = 25°C. Calculate the total entropy generated Sgen [kJ/K] (both in the system and in the surrounding) during the cooling of the tank.

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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.