1. Greg Phillips Greg Phillips Canada says:

    Google it. Robert Brown. Brownian Theory of Motion. Larger particles have the mass to follow an airstream and flow in straight lines. Smaller particles don't have the mass and therefore they zig-zag around instead of following the airstream, and don't move in straight lines. They get bounced around and that is why they are easier to capture than larger particles that move in straight lines.

    • Carlo Wood Carlo Wood Netherlands says:

      They bounce against air molecules, causing them to have an effective diameter larger than their real diameter. However, the effective diameter is at all times LESS than that of a particle with a (slightly) larger diameter. The net result is that smaller particles get captured LESS often. The Brownian motion might cause them to be captured  more often than what would be the case in a vacuum, it is still much much less than 95%. Lets say their effective diameter becomes 10x larger (which I doubt) then the holes are still 200 times larger and they'll fly through with the air unimpeded.

    • Allen Hall Allen Hall United States says:

      The virus when constrain in saliva, TRAVELS WITH the saliva - which wicks thru the mask.

      N95 masks do not stop Virus sized particles period- Yes they do stop saliva droplets.
      BUT WHAT HAPPENS TO THE SALIVA that's trapped in the mask. It wicks thru the paper, carrying the virus with  it until it reaches the surface of the mask. There the saliva EVAPORATES and releases ALL the virus that would have otherwise been constrained by the saliva - WHICH would have fallen immediately to the ground within a few minutes. INSTEAD every time you exhale you now produce a Giant cloud of AIRBORNE virus which stays in the air for HOURS!  Don't believe it?? Then get a cigarette Take a big puff and exhale thru that stupid paper mask.. Can you still smell the smoke in the air?? You bet ya can, and smoke particles are 20 TIMES LARGER than virus !! You people gotta smarten up.. This has never been about keeping people safer - It actually SPREADS THE VIRUS FASTER

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