Kelvin–Planck statement

From Wikipedia, the free encyclopedia
  (Redirected from Kelvin-Planck statement)
Jump to: navigation, search

The Kelvin–Planck statement (or the heat engine statement) of the second law of thermodynamics states that it is impossible to devise a cyclically operating device, the sole effect of which is to absorb energy in the form of heat from a single thermal reservoir and to deliver an equivalent amount of work.[1] This implies that it is impossible to build a heat engine that has 100% thermal efficiency.[2]


  1. ^ Rao, Y. V. C. Chemical Engineering Thermodynamics. Universities Press. p. 158. ISBN 978-81-7371-048-3. 
  2. ^ Young, Hugh D.; Freedman, Roger A. (2008). University Physics. 1 (12 ed.). Pearson Education. ISBN 978-0-321-50125-7.