Bibliography.
J. D. Logan, “Applied Mathematics” or “Εφαρμοσμένα Μαθηματικά”.
Parameters and variables
A system is described via variables. Examples are
Also, we identify the parameters which may have an effect on the system and on the processes that will be described.
A chemical reaction
The reactants are transformed into products.
$$ A \longrightarrow \text{products}. $$
A chemical reactor with volume $V$.
Variable.