Virus lifespan on surfaces and in air explained

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you should ring up NHS, or contact the government with your expertise , I am sure they would want to listen to you.

No response then, bar mocking.

Which you don't take too kindly to, when your imaginary friend is the subject of such derision.

Blind faith, I suppose.....
 
Breadnbutter:

While your here, could you have a word with your god and ask him to make sure there is a hospital bed for Prince Charles if he gets really poorly, or if not possible then a doctor who has enough time free to treat him at home.

Or, of course, instead ask him WTF is this virus all about?
 
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Cool your boots....

OK, how quickly does the droplet fall?
The speed of light?
The speed of gravity?
Some other speed?

(BTW, I do know something about how suspended particles (including droplets) behave, and how long they remain suspended in the air)....

There was a demo on the TV tonight C4 - speed up to 50mph, that must be some cough so read fast. Distance can be over 3m, some university reckoned 6 max, probably a 50mph one. Also a video, drops and aerosol - that mostly went further than the drops. a dry cough wont contain much in the line of drops.

My recollection of trajectory for this sort of thing - sort of parabolic due to speed, more or less straight line dropping with increasing curvature as they slow down due air resistance. One from years ago, sneezes something over 3m if I remember correctly. It was shown in a bus and covered several row of seats and was about flu transmission. This is why people should as least part block coughs and sneezes with their hand what ever is kicking around making people ill.

Rest of the program was usual rubbish showing how easy it is to leave bacteria behind when we touch something. We live with them and they are always around and lots do us no harm at all.
 
Then "half-life" is not the correct way to describe it - otherwise some of them, or their potency, would.
Half life is the observed rate of decay.
The video mentions spread by aerosol, but Corona spreads via droplets.
Yes there has been some rebuttal of the applicability of the experiment based on the use of a medical nebuliser to simulate a sneeze/cough.
 
Right chaps..

Let me try one more time to explain this half-life thingerme.

- Its decay to zero is not proportionate to the quantity you first started with.
- It is a method to find a model to predict the "survival" rate of the virus over time.

Imagine I paint 20 pieces of wood with varying thicknesses of paint. After 1 hour 1/4 were dried after 2 hours, half had dried.. 4 hours all were dry. So the half life of my wet paint based on random thicknesses of paint is 2 hours. Now imagine I repeat for 200 pieces of wood and 20,000 pieces of wood. Each piece of wood is exposed to the same random thickness of paint and will dry at the same rate according to the random circumstances it was painted and set out to dry. With my sample of 20,000, I will not have pieces of wood still drying 10 hours later, providing that my original sample of 20 was statistically relevant.

swap painted wood for virion. The half live measure is a method to find effectively something close to the avg "survival" rate.
 
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What's all this "half life" nonsense?

Half-life as a measure, is a concept used in relation to radioactive materials and nuclear physics.
 
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