English: Preferential concentration of 50 micron hollow glass particles in the homogeneous isotropic turbulence without mean flow when the Stokes number is 1. This clip is uploaded from the Energy & Environmental Flow Laboratory (http://eeflow.snu.ac.kr/) of Seoul national university in South Korea. A paper, "Pseudo real-time continuous measurements of particle preferential concentration in homogeneous isotropic turbulence", using this result is published in "Experimental Thermal and Fluid Science". (https://doi.org/10.1016/j.expthermflusci.2019.109968)