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A black body in equilibrium emits electromagnetic radiation called black-body radiation.
The radiation is emitted according to Planck's law, meaning that it has a spectrum that is determined by the [perception] alone, not by the body's shape or composition.
A black body in equilibrium has two notable properties:
It is an ideal emitter: it emits as much or more energy at every frequency than any other body.
It is a diffuse emitter: the energy is "radiated isotropically", independent of direction.
An isotropic radiator is a theoretical point source of electromagnetic or sound waves which radiates the same intensity of radiation in all directions. It has no preferred direction of radiation. It radiates uniformly in all directions over a sphere centred on the source.
A magic circle is circle or sphere of space marked out by practitioners of many branches of ritual magic, which they generally believe will contain energy and form a sacred space...
or will provide them a form of magical protection, or both.
The idea of a black body originally was introduced by Gustav Kirchhoff in 1860 as follows:
...the supposition that bodies can be imagined which, for infinitely small thicknesses, completely absorb all incident rays, and neither reflect nor transmit any. I shall call such bodies perfectly black, or, more briefly, black bodies.
A more modern definition drops the reference to "infinitely small thicknesses":
An ideal body is now defined, called a blackbody. A blackbody allows all incident radiation to pass into it (no reflected energy) and internally absorbs all the incident radiation (no energy transmitted through the body). This is true for radiation of all wavelengths and for all angles of incidence. Hence the blackbody is a perfect absorber for all incident radiation.
In physics, a physical body or physical object (sometimes simply called a body or object) is a collection of matter with some common attributes, most important, the spatial location.
Continuum mechanics is a branch of mechanics that deals with the analysis of the kinematics and the mechanical behavior of materials modeled as a continuous mass rather than as discrete particles.
Modeling the body as a continuum assumes that the substance completely fills the space it occupies. Modeling in this way ignores the fact that matter is made of atoms, and so is not continuous.
certain physical phenomena can be modeled assuming the materials exist as a continuum, meaning the matter in the body is continuously distributed and fills the entire region of space it occupies. A continuum is a body that can be continually sub-divided into infinitesimal elements...
Infinitesimals have been used to express the idea of objects so small that there is no way to see them or to measure them. The insight with exploiting infinitesimals was that objects could still retain certain specific properties...
reply to post by Wifibrains
Ouch! My head just exploded.
I read everything you posted, twice. I'm going to admit...I understood none of it.
reply to post by Wifibrains
Ouch! My head just exploded. I read everything you posted, twice. I'm going to admit...I understood none of it.
To quote old Will, "Life is a tale told by an idiot, full of sound and fury, but signifying nothing".
Magic is tricks...science is tricks? Magic isnt real. Science isnt real?
Magic is illusions. Science is illusions?
So...subatomic particles are black bodies?
An approximate realization of a black surface is a hole in the wall of a large enclosure (see below).
A realization of a black body is a real world, physical embodiment.
reply to post by Wifibrains
There's a martial art called Wu Wei or Wei Wu (forget which) in which everything is embraced but nothing is held. Is this what you mean?
But that's not right because you're talking about something that absorbs everything but doesn't let it go???
There are really really small particles made in a lab called nano particles or ultrafine particles which essentially don't absorb anything because they have very little substance but which can collect stuff because they have a large surface area. There was an experiment where some nano sized metal particles were place in ice water and radiated with focused sunlight. They collected heat on their surface - tremendous heat - and actually formed a bubble around this heat to protect it. So there were these incredible hot spots within this ice water. Is this what you mean?
I think Kirchoff studied the sun/stars and made his statements trying to explain how the sun/stars operate. Today, there are a number of people who feel that perhaps his explanation needs a re-think. His statements were made in the 1800's, I believe, and there is quite a lot of observing that has gone on since then.
Or are you talking about some hypothetical particle that a magic circle maker utilizes without knowing that they're using it?
certain physical phenomena can be modeled assuming the materials exist as a continuum, meaning the matter in the body is continuously distributed and fills the entire region of space it occupies.
I read this thing the other day where scientists were using DNA to make something and there was a lot of stuff they were throwing out - they were calling it 'junk DNA' and it was kind of appalling to me that just because they didn't know what it was for, it was labelled junk.
To your topic, the isotropic radiator (or receiver), wouldn't you need rather some sort of isotropic mitigator? and how would you set it up as a perimeter?
Or are you saying that human beings possess, within themselves, the ability to do this and just don't know it?