This image of a simulated concrete sample shows the "packing fraction" which describes the fraction of the volume that is filled with solid material. In this case, the average packing fraction is 0.52. Colors indicate the variations within the sample, ranging from less than 0.4 to more than 0.64. The size of the cube is 0.6 microns (millionths of a meter).
Sunday, November 12, 2017