twice the size of a human blood cell micron micron education.mrsec.wisc.edu twice the size of a human blood cell education.mrsec.wisc.edu nm micron micron micron nanometers micron micron about the size of your average virus nanometers micron nanometers http://education.mrsec.wisc.edu/36.htm micron micron education.mrsec.wisc.edu http://education.mrsec.wisc.edu/36.htm http://education.mrsec.wisc.edu/36.htm twice the size of a human blood cell five microns across five microns across http://education.mrsec.wisc.edu/36.htm