Iranian Research Organization for Science and Technology Journal of Particle Science and Technology 2423-4087 5 2 2019 08 01 Mono-Size Distribution Index (MSDI): A new criterion for the quantitative description of size distribution 71 76 832 10.22104/jpst.2019.3455.1144 EN Hamid Moghadam Department of Chemical Engineering, University of Sistan and Baluchestan, Zahedan, Iran Mozhgan Zakeri Department of Chemical Engineering, University of Sistan and Baluchestan, Zahedan, Iran Abdolreza Samimi Department of Chemical Engineering, University of Sistan and Baluchestan, Zahedan, Iran 0000-0003-4214-0100 Journal Article 2019 01 25 Graphical size distribution is widely used in different fields of science and studies related to powders, droplets, bubbles, and pores. However, in some condition it may also be necessary to express the size distribution quantitatively. In spite of there being several suggested ways to quantify size distribution in the literature, some of these approaches are not applicable for many methods and the rest have other drawbacks. In this study, first, some quantitative size distribution methods (such as the polydispersity index) and their defects are concisely discussed. <em>SPAN </em>seems to be the most generally appropriate method, its parameters are determined from cumulative size distribution data. Nevertheless, some specific results imply that there are still some drawbacks in this method. Next, a new quantitative description of size distribution is presented which is applicable to many different techniques. In this method the characterization value is limited to 0 and 1, where 0 is related to completely polydispersed size distribution and 1 denotes the completely monodispersed size distribution. https://jpst.irost.ir/article_832_7250eb93b3c18cc9daa29cf58af7a004.pdf