The lumped Volume component models the relationship between gas mass and pressure based on the mass flow rate. The temperature is assumed to be constant throughout the simulation.

$$\begin{gathered} p\=p_A \\ \mathrm{Specific} \mathrm{internal} \mathrm{energy}\, u \= \mathrm{Function}\left(p\, \mathrm{T\_\_env}\, \mathrm{C\_\_v}\right) \\ \mathrm{Specific} \mathrm{Enthalpy}\, \mathrm{hflow} \= \mathrm{Function}\left(p\, \mathrm{T\_\_env}\, \mathrm{C\_\_p}\right) \\ \mathrm{mflow} \= V\cdot \frac{\ⅆ}{\ⅆt}\mathrm{\ρ} \+ \mathrm{\ρ} \cdot \frac{\ⅆ}{\ⅆt}V \\ \mathrm{\ρ} \= \mathrm{Function}\left(R\, p\, \mathrm{T\_\_env}\right) \end{gathered}$$