Just How Small is a Micron Anyway?

Looking in a microscope

We’ve been talking a lot about our new air purifiers this month. You’ve probably seen in the description that they both feature a HEPA filter that is “designed remove over 99% of tiny particles down to 0.3 microns.” This got us thinking – just how small is 0.3 microns?

A micron, more formally known as a micrometer, is a unit a measure that refers to 1×10-6 of a meter, or one-millionth of a meter. In inches, one micron is equal to 0.000039 inches. To put it another way, there are 25,400 microns in one inch. So, based on the conversion rate, 0.3 microns would equal 0.0000117 inches.

Let’s put that in perspective. Here are a few common items with their
measurements listed in microns:

  • 1-inch stamp: 25,400 microns
  • Eye of a needle: 1,230 microns
  • Particle of sand from the beach: between 100-2,000 microns
  • Pollen: anywhere from 10-1,000 microns

We can’t even fathom just how small 0.3 microns is, so to make it easy we’re just say incredibly small.

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