2013-3-6 Kelvin-Planck Statement of the Second Law It is impossible for any system to operate in a thermodynamic cycle and deliver a net amount of energy by work to its surroundings while receiving energy by heat transfer from a single thermal reservoir. Entropy Statement of the Second Law Mass and energy are familiar examples of extensive properties used in thermodynamics Entropy is another important extensive property. How entropy is evaluated and applied is detailed in Chapter 6. Unlike mass and energy,which are conserved, entropy is produced within systems whenever non-idealities such as friction are present. The Entropy Statement is: It is impossible for any system to operate in a way that entropy is destroyed. 62013-3-6 6 Kelvin-Planck Statement of the Second Law It is impossible for any system to operate in a thermodynamic cycle and deliver a net amount of energy by work to its surroundings while receiving energy by heat transfer from a single thermal reservoir. Entropy Statement of the Second Law ►Mass and energy are familiar examples of extensive properties used in thermodynamics. ►Entropy is another important extensive property. How entropy is evaluated and applied is detailed in Chapter 6. ►Unlike mass and energy, which are conserved, entropy is produced within systems whenever non-idealities such as friction are present. ►The Entropy Statement is: It is impossible for any system to operate in a way that entropy is destroyed