Jul

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Droplet or aerosol ?

July 7, 2020 |

Check out this story: 'Serious threat': Scientists say WHO ignores aerosol risk of coronavirus from Flipboard .

Henry Gifford asks:

What is the difference between droplet and aerosol?

People spit out viral particles, and the particles stay in the air for some time, with a decay rate of X % per time. Maybe below some threshold it is called droplet, and above some threshold it is called aerosol?

 I don't get it. Reminds me of the endless article a few months ago about if the epidemic is a pandemic, or will it become a pandemic and when, then the discussions of the definition of a pandemic…

 

K. K. Law replies:

I don't have a scientific distinction between the two. The very qualitative and non-scientific difference between the two is droplets will eventually land on some surfaces sooner (maybe in a couple of minutes) than aerosols which could suspend in air for much longer in time.

 
 

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2 Comments so far

  1. none on July 9, 2020 10:06 am

    We have not even gone through 1 winter as of yet. In the 1918 pandemic there were almost 3 winters towards the sickness.

    Persons suggest technical advancement is way ahead from 100 years ago, I suggest that even the common cold is still in place as then.

    Scientist change just 1 little gene in the DNA process and the sky has open up, ‘nature’ does this same process at a rate of 56 millions more and faster then we can changing that 1 gene.

    The changes that people see today as ‘restrictions’ states just how much freedom has been and continues to be alive and well. Its this change in sentiment by persons being so bullish on every possible subject weather its race, health, and or being rich that has had the money wrench thrown into to the mix.

    ………….What better timing for a Major World Wide Melt Down, when the entire Nation (and World) focusing and literally throwing/destroying ‘human history’ (statues) of those that have created Major turning points in Human History.

    Thus observing racial extreme sentiment at the very heights toward human emotions.

    A…………50 trading day FED asset bubble.

    Major popping of bubble, Major 2nd 2020 downward move in place.

    :)

  2. Parwane Pagano on July 16, 2020 8:39 pm

    Aerosols are defined as a suspension of solid or liquid particles dispersed in the air (or other gas). Fine aerosols are less than 5 microns and can penetrate the lower respiratory tract. Large aerosols are greater than 5 microns, and very large aerosols, referred to as droplets, are 10 microns.

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