What significance does brownian motion has to do with coal explosion?

[SecretOfnumber]

Apparently :

What significance does brownian motion has to do with coal explosion?[Brownian motion or pedesis is the presumably random moving of particles suspended in a fluid (a liquid or a gas) resulting from their bombardment by the fast-moving atoms or molecules in the gas or liquid.]

Now I wish to know if This movement has anything to do with gas explosion?(Underground mining)
And does this motion happens under pressure in a coal seam?...briefly:

does gas show same property underground?(pressure,fluid,heat)And what techniques could speed it up?

Cheers,
SON

 

[CWatters]

Brownian motion is a small scale effect, typically you need a microscope to observe it. I suspect movement of coal dust is likely to be dominated by larger scale effects such as ventilation or convestion?

 

[Naty1]

http://en.wikipedia.org/wiki/Coal_dust_explosion

has some interesting discussion but no mention of Brownian motion...

... Dust is defined as powders with particles less than about 500 micrometres in diameter, but finer dust will present a much greater hazard than coarse particles by virtue of the larger total surface area of all the particles...

 

[SecretOfnumber]

Brownian motion is a small scale effect, typically you need a microscope to observe it. I suspect movement of coal dust is likely to be dominated by larger scale effects such as ventilation or convestion?

Thanks
Just wondering how small?(in scale) with coal seam under hydrostatic pressure what could be changed ?imagine a 10 meters thickness of coal (in a range of 10 kilometers) 400 meters under surface, what could we expect to see when many things ,including hydrostatic pressure changes ?and gas(ch4)starts to flow?

Cheers