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" ... An aircraft cabin’s air is replaced every two to three minutes. Aircraft engines take in fresh air and mix it with cabin air that passes through a HEPA filter that can capture over 99.97% of micron particles, the CAAC said. ... "
" ... Semiconductor manufacturers started to use the "nanometer" term around the beginning of this millennium when chip gate lengths had already been shrunk well below a micron. The gate length is the basic measure of how small a chip can be manufactured. One micron is one millionth of a meter, or one thousandth of a millimeter. ... "
" ... The Air Pro uses an integrated particle sensor that detects the amount of particulate matter in its current location down to 1 micron. It doesn't detect volatile organic compounds (VOCs), mold, bacteria, or viruses. Yes, the Air Pro is still destroying these by trapping them in the filter and bombarding the particles with UV light, but there's no way for an air filter, no matter how advanced, to detect bacteria, mold, and viruses in the air in real time. To detect those, you need specialized sensors that can take 24 hours or more to provide results. The Air Pro is more interested in what's going on in your air right now. ... "
" ... The Intel 4004 was made in a 10 micron (µm) process. A micron is one-millionth of a meter. So, 10µm is one-hundred-thousandth of a meter. You can almost see something that big. In Wikipedia, examples of things 10µms wide include a droplet of mist or a strand of spider web silk. ... "
" ... The tiny size means that his camera and microscope needed to be able to move closer or farther by just a micron at a time. A micron, or millionth of a meter, is legitimately tiny. Human hairs measure 80 to 100 microns wide, so the motors needed to be amazingly precise with very fine control. ... "