Face coverings

[Stubby]

4 hours ago, TIMON said:

 

 

 

In America... statistically you have a 99.8% chance of full recovery if you catch Covid....

 

 

 

 

 

 

 

 

 

 

 

Just in America ?

[TIMON]

Just in America ?

I think it’s pretty close to that everywhere. Stubby.

It never seems to amaze me, the wide variation of the value placed on human life, depending on where and who..

[Billhook]

This letter was in the Telegraph last week from two surgeons who said they had not worn masks for twenty years as in trials it had shown no benefit and may have caused harm in some patients post op

[Khriss]

Alan Alda wore them in M.A.S.H  that's good enuff fr me pal.  K

[openspaceman]

49 minutes ago, Khriss said:

Alan Alda wore them in M.A.S.H  that's good enuff fr me pal.  K

I'm not going to comment on whether  requiring facemasks to be worn in shops was worthwhile, I have donned one twice to go shopping.

 

However a surgeon or dentist wears them for entirely different reasons, to prevent splashes being inhaled. Mind I was most surprised when my dentist started using them 20 years ago and wondered what had prompted it at the time.

[Stubby]

9 hours ago, Khriss said:

Alan Alda wore them in M.A.S.H  that's good enuff fr me pal.  K

Hot lips !

[Billhook]

Just had a look at particle sizes and it seems that a virus at 0.005 is much smaller than a particle of wood smoke at 0.2 and I can definitely smell wood smoke through my high grade mask!

 

 imperial units

• 1 inch = 25400 microns
• 1 micron = 1 / 25400 inch

The eye can in general see particles larger than 40 microns.

Typical size of contaminants and particles are indicated below. Note that the values varies widely depending on how the products are processed. By example milling corn starch in 30 minutes can reduce the average diameter of starch particles from 10 to 0.3 microns (μm, 10^-6 m). Further milling may produce particles even smaller than 0.1 microns.

Particle	Particle Size (microns)
Anthrax	1 - 5
Antiperspirant	6 - 10
Asbestos	0.7 - 90
Atmospheric Dust	0.001 - 40
Auto and Car Emission	1 - 150
Bacteria	0.3 - 60
Beach Sand	100 - 10000
Bone Dust	3 - 300
Bromine	0.1 - 0.7
Burning Wood	0.2 - 3
Calcium Zinc Dust	0.7 - 20
Carbon Black Dust	0.2 - 10
Carbon Dioxide	0.00065
Cayenne Pepper	15 - 1000
Cement Dust	3 - 100
Clay, coarse	2 - 4
Clay, medium	1 - 2
Clay, fine	0.5 - 1
Coal Dust	1 - 100
Coal Flue Gas	0.08 - 0.2
Coffee	5 - 400
Combustion	0.01 - 0.1
Combustion-related - motor vehicles, wood burning, open burning, industrial processes	up to 2.5
Copier Toner	0.5 - 15
Corn Starch	0.1 - 10
Dot (.)	615
Dust Mites	100 - 300
Eye of a Needle	1230
Face Powder	0.1 - 30
Fertilizer	10 - 1000
Fiberglass Insulation	1 - 1000
Fly Ash	1 - 1000
Gelatin	5 - 90
Ginger	25 - 40
Glass Wool	1000
Grain Dusts	5 - 1000
Gravel, very fine (0.08 inch)	2000
Gravel, fine (0.16 inch)	4000
Gravel, medium (0.3 inch)	8000
Gravel, coarse (0.6 - 1.3 inches)	15000 - 30000
Gravel, very coarse (1.3 - 2.5 inches)	30000 - 65000
Ground Limestone	10 - 1000
Hair	5 - 200
Household dust	0.05 - 100
Human Hair	40 - 300
Human Sneeze	10 - 100
Humidifier	0.9 - 3
Insecticide Dusts	0.5 - 10
Iron Dust	4 - 20
Lead, solder radiator manufacturing - mean value	1.3
Lead, battery and lead powder manufacturing	12 - 22
Lead Dust	0.1 - 0.7
Liquid Droplets	0.5 - 5
Metallurgical Dust	0.1 - 1000
Metallurgical Fumes	0.1 - 1000
Milled Flour, Milled Corn	1 - 100
Mist	70 - 350
Mold	3 - 12
Mold Spores	10 - 30
Mustard	6 - 10
Oil Smoke	0.03 - 1
One inch	25400
Oxygen	0.0005
Paint Pigments	0.1 - 5
Pesticides & Herbicides	0.001
Pet Dander	0.5 - 100
Pollen	10 - 1000
Radioactive Fallout	0.1 - 10
Red Blood Cells	5 - 10
Rosin Smoke	0.01 - 1
Sand, very fine (0.0025 inch)	62
Sand, fine (0.005 inch)	125
Sand, medium (0.01 inch)	250
Sand, coarse (0.02 inch)	500
Sand, very coarse (0.02 inch)	500
Saw Dust	30 - 600
Sea Salt	0.035 - 0.5
Silt, coarse (0.0015)	37
Silt, medium (0.0006 - 0.0012 inche)	16 - 30
Silt, fine	8 - 13
Silt, very fine	4 - 8
Skin flakes	0.5 - 10
Smoke from Natural Materials	0.01 - 0.1
Smoke from Synthetic Materials	1 - 50
Smoldering or Flaming Cooking Oil	0.03 - 0.9
Spanish Moss Pollen	150 - 750
Spider web	2 - 3
Spores from plants	3 - 100
Starches	3 - 100
Sugars	0.0008 - 0.005
Talcum Dust	0.5 - 50
Tea Dust	8 - 300
Textile Dust	6 - 20
Textile Fibers	10 - 1000
Tobacco Smoke	0.01 - 4
Typical Atmospheric Dust	0.001 to 30
Viruses	0.005 - 0.3
Yeast Cells	1 - 50

• one micron is one-millionth of a metre
• 1 micron = 10^-6 m
• 1 micron = 1000 nano metre

Airborne particles

Airborne particles are solids suspended in the air.

Larger particles - larger then 100 μm

• terminal velocities > 0.5 m/s
• fall out quickly
• includes hail, snow, insect debris, room dust, soot aggregates, coarse sand, gravel, and sea spray

Medium-size particles - in the range 1 to 100 μm

• sedimentation velocities greater than 0.2 m/s
• settles out slowly
• includes fine ice crystals, pollen, hair, large bacteria, windblown dust, fly ash, coal dust, silt, fine sand, and small dust

Small particles - less than 1 μm

• falls slowly, take days to years to settle out of a quiet atmosphere. In a turbulent atmosphere they may never settle out

[Khriss]

@Billhook Hmmm,  don't see farts listed ? are you sure this is comprehensive ? K

Edited August 4, 2020 by Khriss
( an how can a ginger get thru yr mask ? is this another one of their superpowers ? )

[Billhook]

1 minute ago, Khriss said:

@Billhook Hmmm,  don't see farts listed ? are you sure this is comprehensive ? K

I can assure you that if you stand behind someone the morning after a night out on Batemans Triple X, the gases will penetrate even the most sophisticated mask, and I would suggest that most of the particles are bigger than a virus!

[Khriss]

......scarey big I will attest  ?  k