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• 22:10, 16 March 2026 Nian talk contribs created page Isentropic relations (Created page with "Category:Compressible flow Category:Thermodynamics __TOC__ === First law of thermodynamics === First law of thermodynamics: <math display="block"> de=\delta q - \delta w </math> For a reversible process: <math>\delta w=pd(1/\rho)</math> and <math>\delta q=Tds</math> <math display="block"> de=Tds-pd\left(\frac{1}{\rho}\right) </math> Enthalpy is defined as: <math>h=e+p/\rho</math> and thus <math display="block"> dh=de+pd\left(\frac{1}{\rho}\right)+\left(\f...")