Comparing volume To compare the volume of liquids you can start by looking at the containers they are in. However, to compare volumes more precisely, they need to be measured.

Comparison of the Prognostic Value of Assessing Tumor Diameter Versus Tumor Volume at Diagnosis or in Response to Initial Chemotherapy in Rhabdomyosarcoma. JCO 28 , 1322-1328 (2010). DOI: ...

PURPOSE: Lesion volume is often used as an end point in clinical trials of oncology therapy. We sought to compare the common method of using orthogonal diameters to estimate lesion volume (the ...