@RMConservative Thread/
Remember when you were a kid, you would look out the window on those lazy days and see dust particles floating between you and the sunlight?
Remember when you were a kid, you would look out the window on those lazy days and see dust particles floating between you and the sunlight?
Our human vision is limited to around 40 microns, or the width of a human hair, so those dust particles were around that size and bigger.
The dust floated because air currents (flow) provided buoyancy/drag versus gravity trying to pull the dust down to the ground.
The dust floated because air currents (flow) provided buoyancy/drag versus gravity trying to pull the dust down to the ground.
A brilliant physicist by the name of Stoke’s quantified this effect in a mathematical law named after him to explain the behavior of extremely small particles in a fluid or gas (air).
Stoke’s Law takes a small particle in the air at normal temperature and pressure and then is able to calculate how fast it falls to the ground assuming the air is still.
Now, when humans jump out of airplanes, we reach a max velocity of 120 mph— so air creates that much buoyancy
Now, when humans jump out of airplanes, we reach a max velocity of 120 mph— so air creates that much buoyancy
Debris from space burns up almost immediately upon entering the atmosphere (air) because it is going 25,000 mph when hitting the earth’s atmosphere.
So what about a 0.1 micron sphere or virus-size?
It’s falling velocity was calculated decades ago.
It turns out to be 0.000088 cm/sec— attached.
So a 6 foot-tall person releasing a 0.1 micron virus particle from their mouths is estimated to take 23 days to fall to the ground
It’s falling velocity was calculated decades ago.
It turns out to be 0.000088 cm/sec— attached.
So a 6 foot-tall person releasing a 0.1 micron virus particle from their mouths is estimated to take 23 days to fall to the ground
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