2a List all statements and principles associated with the 2

2a. List all statements and principles associated with the 2 nd law of thermodynamics. (2 points)

2b. Please list at least three approaches capable increasing the entropy of a closed system. (3 points)

Solution

2a. Kelvin-Planck statement of second law: It is impossible for a heat engine to produce net work in a complete cycle if it exchanges heat with only with bodies at a single fixed temperature.

Calusius statement of second law: It is impossible to construct a device, which operating in a cycle will produce no effect other than transfer of heat from a cooler to a hotter body.

Second law of thermodynmics: It states that state of entropy of universe considered as an isolated system and it always increases over time. It may remain constant when process undergoes a steady state or a reversible process.

2b. Three approches are i) heating from external source, ii) polytropic compressionor, iii) isothermal compression.