it led to a study of how to induce cancer cells to divide more rapidly
Viscosity refers to the speed at which a substance can flow (i.e. the thickness of the substance/its ability to flow). I think that's the closest the English language gets.
To compute inpiratory reserve volume (irv), one would need to know and it is: IRV = VC - (TV+ERV)
Inspiratory reserve volume is the maximal amount or more air that can be drawn into the lungs by determine effort after normal inspiration - assimilate expiratory reserve volume.