Simple question, in materials publications I often see the relative change of volume in a system reported as
$$ \Delta \left (V \right )/V $$
is the denominator volume supposed to be initial or the final volume? I would assume it is the final volume as it likely parallels the relative error calculation, but I'd like to make sure.
-- It occurs to me that this is actually very likely dependent on the situation, still input would be appreciated.