@article{anacleto_2005,  title={Entropy change of an ideal gas determination with no reversible process},  volume={27},  ISSN={1806-1117},  url={https://doi.org/10.1590/S1806-11172005000200012},  DOI={10.1590/S1806-11172005000200012},  number={2},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Anacleto, Joaquim},  year={2005},  month={Apr},  pages={259–262} }