Jednačina stanja

Jednačina stanja je jednačina koja preko pritiska, temperature i zapremine opisuje ponašanje gasa i izražava se u obliku ${\ f(p,V,T)=0}.$

Jednačine stanja za posebne modele[uredi | uredi kod]

Jednačina stanja idealnog gasa: ${\ pV=nRT}.$
Jednačina stanja Van der Valsovog gasa: ${\left(p+{\frac {a}{V_{m}^{2}}}\right)\left(V_{m}-b\right)=RT}$
Redlih-Kvongova (Redlich-Kwong) jednačina stanja: ${p={\frac {R\,T}{V_{m}-b}}-{\frac {a}{{\sqrt {T}}\,V_{m}\left(V_{m}+b\right)}}}$
Soaova modifikacija Redlih-Kvongove jednačine stanja: $p={\frac {R\,T}{V_{m}-b}}-{\frac {a\,\alpha }{V_{m}\left(V_{m}+b\right)}}$
Peng-Robinsonova jednačina stanja: $p={\frac {R\,T}{V_{m}-b}}-{\frac {a\,\alpha }{V_{m}^{2}+2bV_{m}-b^{2}}}$
Peng-Robinson-Strajek-Vera (Peng-Robinson-Stryjek-Vera) jednačina stanja: $\kappa =\kappa _{0}+\left[\kappa _{1}+\kappa _{2}\left(\kappa _{3}-T_{r}\right)\left(1-T_{r}^{0.5}\right)\right]\left(1+T_{r}^{0.5}\right)\left(0.7-T_{r}\right)$
Eliot-Sureš-Donohova (Elliott, Suresh, Donohue) jednačina stanja: ${\frac {pV_{m}}{RT}}=Z=1+Z^{\rm {rep}}+Z^{\rm {att}}$
Dietrići (Dieterici) jednačina stanja: $\ p(V-b)=RTe^{-a/RTV}$
Virialova jednačina stanja: ${\frac {pV_{m}}{RT}}=1+{\frac {B}{V_{m}}}+{\frac {C}{V_{m}^{2}}}+{\frac {D}{V_{m}^{3}}}+\dots$
Benedikt-Veb-Rubinova jednačina stanja: $p=\rho RT+\left(B_{0}RT-A_{0}-{\frac {C_{0}}{T^{2}}}+{\frac {D_{0}}{T^{3}}}-{\frac {E_{0}}{T^{4}}}\right)\rho ^{2}+\left(bRT-a-{\frac {d}{T}}\right)\rho ^{3}+\alpha \left(a+{\frac {d}{T}}\right)\rho ^{6}+{\frac {c\rho ^{3}}{T^{2}}}\left(1+\gamma \rho ^{2}\right)\exp \left(-\gamma \rho ^{2}\right)$