Received: 15 November, 2005. Accepted: 1 December, 2005.

Presented at DECOS 2005.

SUMMARY

The Clausian introduction of entropy is based on an unnecessary restriction, namely that diminishing circle integral leads to a unique state variable. Eliminating that restriction a family of entropy-like function is introduced. After we have chosen one, called extropy, which has better properties as the well known entropy.

KEY WORDS

thermodynamics, entropy, extropy

CLASSIFICATION

PACS:

05.70.-a, 05.70.Ln