1,000,000:1 = 10-6 0.000 000 15 เมตร
1,000,000:1 = 10-6 0.000 000 15 meters
. This scale has a magnification of a million. The electron microscope therefore can no longer give us clear images, for at most it can magnify 100,000 times. A more schematic image is therefore unavoidable, that is, a diagram rather than a photographic enlargement. Yet we know that there would still be living creatures. We show the infantile paralysis virus (1), already visible in -5, and one of hoof and mouth disease (2). The latter is about the smallest now known. Apart from the viruses shown there exist several with shapes sharply different from these wholly or nearly spherical forms. The sinusoid (3) shown is of an ultraviolet ray. The dots in the upper left quadrant indicate molecules of the air. The inset has the flagellum composed of three strands as already shown in -5. The height of the salt crystal on this scale would be 500 meters.
* The term micron and the symbol μ, representing one-ten-thousandth of a meter 1/10 of a millimeter, were officially accepted between 1879 and 1967, but officially revoked by the ISI in 1967. Since then the term micron has come to represent a micrometer, one-millionth of a meter (1/1000 of a millimeter, or 0.001 mm). Its unit symbol in the International System of Units (SI) is μm, so 0.01μ(1879-1967 microns)
equal 1μm(present day)