in other words light intensity and quality background and particle type. - particles on furniture and those in a shaft of light are approximately 50 microns or larger. - it may be possible to see particles as small as 10 microns under favorable conditions. - the majority of harmful particles are 3 microns or less in size.
fogscreen is an exciting new projection technology that allows you to project images and video onto a screen of "dry" fog creating the illusion that the images are floating in midair.
a hazardous particulate size less than 5 microns. particle sizes of 2.5 micron (pm 2.5) are often used in usa. the total allowable particle concentration - building materials combustion products mineral fibers and synthetic fibers (particles less than 10 μm) - specified by epa (u.s. environmental protection agency)
if the anodizing has any color to the dye it's type ii not type iii and therefore closer to that 0.0006" thickness. but let's say it's triple--it's still 46/1000 of a millimeter or <5 microns. a good electroplated lining can be triple *that* and 15 microns of nickel or chrome still isn't a big deal. i'm not forgetting the disk.
particle size - microns. sand tailings mist. ground limestone. pollens: spray dried milk cement dust pulverized fuel fly ash smelter dust & fumes sulfuric acid mist & fumes: coal smoke atmospheric dust foundry dust: asphalt paving. not visible to the eye visible to the eye. particle size chart. rain drops flour mill dust. insecticide dust. merv
this micron sizing chart is fairly complete. to the best of my knowledge and by comparison to other particle size charts online the list below is identical to numerous charts and data i found on the internet – information is provided without warranty or guarantee of accuracy of any kind.
micron is the measure of length most frequently used to describe tiny particle size. the term micron is actually a commonly used shorthand for micrometer (american spelling) or micrometre (international spelling). the official symbol for micrometer is μm sometimes simplified as um. a micrometre is defined as one-millionth of a meter a little
the iest journal has an interesting article on cleanroom metrology by lothar gail. within the article i an exploration of the 5 micron particle size issue. as those involved with cleanrooms will know there are two particle count sizes looked for within cleanrooms: 0.5 and 5.0 micron. the fda
small particles pass through the first screen (800 microns). grounds that are smaller still move though the second (400 microns). ideally you want to have most of your grounds land in the middle