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The spark that travels can either be between the negatively charged PVC and the positively Static electricity air, or it can be from surface to surface on the PVC.
Since the PVC does not conduct, it will not equalize the charge throughout the length or even diameter of the pipe. As a result, there is the potential for the spark to jump from one section of the PVC to another.
Even an internal ground wire will not prevent this, as the wire only covers a small portion of the surface. Explosion Any material that can burn can also explode under the right conditions. I think it may even be possible for non-flammable materials to explode too.
This all relates to the concentration of the material. If the concentration is too low, then there is not enough proximity between particles to support a chain reaction.
If the concentration is too high, then the mixture is considered too rich, and there will not be enough air available for rapid combustion.
Looking at gasoline for example. It should be fairly obvious that too little concentration will not explode, otherwise gas stations would literally be "popping up" everywhere.
What is a little more difficult to understand is the concept of the UEL.
|Static shocks and how to avoid them||While doing this, you should be careful of static electricity, which can harm your computer.|
Do not try this! But I saw a match dropped into a small container of gas. Since there was not enough oxygen for combustion, there was no fire or explosion--the match went out.
This was a scientific demonstration under controlled conditions by an expert, do not try it yourself. I am not aware of any published LEL or UEL for sawdust as these numbers will vary depending on particle size, moisture content, etc.
Some Reality Checks Q: Why doesn't my shop vac explode? Because the air velocity in a shop vac is high, the static build up is also very high, and sparks happen frequently inside the hose. However, the same high velocity of the air also reduces the chance for an LEL concentration to develop within the hose.
In this case, you have the ignition source, but don't have the explosive concentration. Why are there so few occurrences of explosions in home shops? Home shop explosions are not impossible, but they are rare.
This is because you need both an LEL concentration and an ignition source at the same time and same place. The odds are low, but not zero. When you are sanding, not only is the LEL concentration likely to occur, but the increase in particulate will also increase the frequency of electrical discharges within the pipe--it is just a matter of timing.
When you are cleaning out your ductwork system, not only do you have electrical discharge present from particulate travel, but you will also have frequent occurrences of LEL concentrations, whether in small pockets, or throughout the length of the system.
The chances here are much higher.Static electricity means the increase of electric charge on the surface of objects. This electric charge remains on an object until it either flows into the ground, or loses its charge quickly by a discharge.
Purpose. To introduce students to static electricity as a phenomenon that involves positive and negative charges. Context. This lesson is the second of a four-part series on static electricity. Our Hosts and Venue: NIAR and Electromagnetic Applications, Inc. at Wichita State University.
The National Institute for Aviation Research is a department of Wichita State University specializing in aviation research and technology. static - Translation to Spanish, pronunciation, and forum discussions.
Electrostatics is the reader's opportunity to learn from A. D.
Moore (), the unquestioned authority on static electricity, as he recounts his lifetime of experimentation and invention. It is written in an exceptionally clear and direct prose that the reader might think he/she is actually hearing the author talk about the history of the exploration of electrostatics.
Electrostatics is a branch of physics that studies electric charges at rest.. Since classical physics, it has been known that some materials such as amber attract lightweight particles after initiativeblog.com Greek word for amber, ήλεκτρον, or electron, was the source of the word 'electricity'.Electrostatic phenomena arise from the forces that electric charges exert on each other.