# Mass, momentum and energy…How many equations for more then one elements? [closed]

Basically, for solving 1D flow equations, one uses the mass, momentum and energy equations (Also known as Euler equations). Say now I have $N$ elements in series, will I be using $3N$ equations?

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## closed as unclear what you're asking by BebopButUnsteady, Alan Rominger, Dilaton, Qmechanic♦Jul 29 '13 at 20:16

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What do you mean by element, a tracer? –  Dilaton Jul 29 '13 at 17:58

Not exactly. You still have your three Euler equations: $$\partial_t\rho + \partial_x\rho v_x=0$$ $$\partial_t\left(\rho v_x\right)+\partial_x\left(\rho v_x^2+P\right)=0$$ $$\partial_te +\partial_x\left[\left(e+P\right)v_x\right]=0$$ but what you are doing is solving the system of 3 equations $N$ times (once for each cell).