Ozie wrote:i just wanna talk about the theories behind it.
i mean once you suck the air out of a structure to form a vacuum whats left?
what are those particles doing?
But to talk about the theories behind QED, you need a decent understanding of the mathematics underpinning it. That's Physics.
I'll answer the vacuum bit.
Say you have a perfectly sealed room where the walls, floor and ceiling are all made of stainless steel, hooked to a vacuum pump. At atmosphere, you have molecules of gas, dust and all kinds of other things floating around. In a normal room, your walls would be coated with paint but for the sake of discussion, this is now stainless steel with no pitting. If you turn on your vacuum pump, what it does is to remove all the gas molecules out of that room. It does take an almighty long time though.
So from having all these molecules of gas, dust and other things floating around, you're removing each of these things bit by bit. So instead of having an oxygen molecule say every cm^2, you may after 1hr of pumping out have only one oxygen molecule every 100cm^2. Less collisions between these particles then exist. As you pump down, it gets harder and harder to remove things since these molecules are also at corners of the room. This is why you usually see vacuum chambers for science being in a spherical shape.
Since there are also less molecules and particles in the room, there's less inter-particle collisions, thus slowing everything down the overall speed of particles within the room. So alot of the particles now will be slower stationary. And since they are slower, their relativistic energies are also lower.
Hope that makes sense.
