Roshi wrote:So - particles of matter move (when that matter is hot), then - what do they mean by "it does not need a medium to propagate"? To what do those particles transmit their movement?
And how come heat can travel in space, but electricity can't?
I aint a scientist but here iz what i am thinking. They sayd a material medium, ie matter (ok). But there are some shortcomings.
There are three kinds of radiation, & all are a heat radiation.
em radiation is due to photaenos, not photons. And photaenos hav energy mass & momentum & inertia etc.
Photaenos are emitted by all matter all of the time, even at zero K. This means that zero K aint what they think.
However not all photaenos affect temp. Temp aint affected by magnetism or charge etc, temp is affected by nett magnetism & nett charge. Or putting it another way what we call magnetism is the nett result of a photaeno war, with some photaenos negating others (charge wize)(& magnetizm wize), the negated photaenos being in effect invizible to matter (& thusly having no effect on temp).
Photons too hav energy mass momentum inertia. Photons are emitted if the temp iz over zero K.
The third radiation iz gravity. This iz emitted by all matter all the time (& by photaenos & photons), at all temps (ie even at zero K). Gravity affects velocity (or trys to). And velocity can manifest as temp.
Electricity travelling in space is a tough question. Charged particles travelling in space are one kind of electricity (or 3 kinds)(praps more). But Heaviside & Catt & Bishop sayd that an electric current is aktually an energy current, consisting of an E by H slab. They reckon that E by H slabs are em slabs, made of photons. But i know that em slabs consist of photaenos (small scale aetheric excitations which emanate from all photons)(photons too being aetheric excitations of a different kind)(gravity being due to a bulk acceleration of aether rather than an excitation).
Slabs of course consist of individual photaenos, each photaeno being a kind of mini slab if u like. Once again we hav a photaeno war, & the slab is aktually the nett slab, the negating mini slabs being in effekt invizible to matter (ie giving zero nett current).
So, what iz electricity? I reckon that we hav a number of kinds of electricity consisting of the moovment of particles (eg electrons protons ions etc), particles can of course travel in empty space. And we hav one kind of electricity consisting of a nett E by H slab of photaenos, that can travel in empty space (& can travel in matter)(or at least can travel in the empty space in atoms & tween atoms etc).
I dont think that photons can be called electricity. They hav no nett charge etc. But in some instances photons are as good as electricity.