On Thu, 03 Sep 2009 17:37:20 +0200, Stephen <mcavoysAT@aoldotcom> wrote:
> Actually it is quite hard to ignite petrol from a petrol pump with a  
> naked flame.

That depends on the flame.


> Besides having a LEL (Lower Explosive Limit) petrol has an Upper  
> Explosive Limit (UEL) where above that level the gas/air mixture is
> too rich to burn. In the open air the gas/air mixture goes from too
> rich to too leen very quickly. I once saw a petrol pump attendant put
> a lit cigarette into the mouth of a full petrol tank.

http://www.intuitor.com/moviephysics/mpmain.html#cigarettes



-- 
FE

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