Why are hydrodynamic theories applicable beyond the hydrodynamic regime? Sunil Jaiswal, Jean-Paul Blaizot, Rajeev S. Bhalerao, Zenan Chen, Amaresh Jaiswal and Li Yan EPJ Web Conf., 296 (2024) 13007 Published online: 26 June 2024 DOI: 10.1051/epjconf/202429613007