What happens when an object that is 1.0microns in size tries to get through an opening that is 0.3 microns?I see you're still having a hard time with this. What happens in addition to a cough or a sneeze that releases droplets??
Lets see if you can figure this out
I'll even give you a hint. Try to remember when you were a little kid and what happened when you tried to put that square block through the round hole. It's a very similar situation. I suspect you figured it out then and hopefully you still can.
That answers your question.
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