Units for Particulate Measurement
Units for particulate powder measurement
a) One angstrom unit (A.O. or Å)= 0.1 nanometers, or one ten-thousandth of a micron (10-4 microns), or one hundred-millionth of a centimeter (1 x 10-8 cm.).
b) One angstrom is the diameter of a hydrogen atom -- the smallest element.
Particulate Measurement Definitions:
a) Apparent Density (g/cm3)= weight in grams x 0
b) Flow Rate= Time in seconds per 50 grams
c) Mesh= Number of openings per lineal inch, starting with a ruler zeroed on the center of any wire
d) Micron= One micron (µ) equals 10-4 centimeters or 0.001 millimeters
e) Nano= A prefix meaning one billionth or 10-9. The symbol is n
f) Nanometer= One nanometer (nm) equals ten angstroms or 1 millimicron
g) Sieve Analysis refers to the particle size distribution, usually expressed as weight percentage retained upon each of a series of standard sieves of decreasing size and the percentage passed by the sieve of finest size
h) Surface Area= A measure of the surface area per unit weight
i) Wavelength= One wavelength (at 5500 Å) equals 21.8 x 10-6 inches