\[ \underbrace{c_{ij}}_{\substack{\text{convection term}}} = \underbrace{d_{ij}}_{\substack{\text{diffusion term}}} + \underbrace{P_{ij}}_{\substack{\text{production term}}} + \underbrace{\phi_{ij}}_{\substack{\text{redistribution term}}} - \underbrace{\varepsilon_{ij}}_{\substack{\text{dissipation term}}} \]