Sentences with phrase «body radiating surfaces»

Now surround body «B» with body «A», which is also a thin spherical shell (external radius RE) with internal and external black body radiating surfaces, but contains no internal radioactive energy source.

Not exact matches

The Stefan — Boltzmann law states that the total energy radiated per unit surface area of a black body across all wavelengths per unit time (also known as the black - body emissive power) is directly proportional to the fourth power of the black body's absolute temperature.

How can the earth be radiating a crude BB type spectrum corresponding to the surface Temperature when Trenberth claims that only 40 W / m ^ 2 escapes to space in the atmospheric window, and folks insist that the main body of the atmosphere (gases) does not emit thermal radiation.

The sea surface radiates IR like any other black body.

For the up / down /» back» radiation of greenhouse theory's GHG energy loop to function as advertised earth's «surface» must radiate as an ideal black body, i.e. 16 C / 289 K, 1.0 emissivity = 396 W / m ^ 2.

Further assume that the shell's internal and external surfaces radiate as a black body.

As I recall, this is based on the theory that the structure of the black body surface is so complex that it has a continuous spectrum of oscillatory mechanisms and can thus radiate or absorb at any frequency with equal probability.

For these conditions, when radiation - rate - equilibrium is reached for the «two - shell system» (i.e., when the rate of energy being radiated outward by the outer shell equals the rate of energy being generated in the wall of the inner shell, I believe the presence of body «A» will affect the temperature of the external surface of the inner shell.

The rate of energy radiated by a block body at temperature T Kelvins is proportional to the fourth power of T and the surface area A of the black body.

When you have two radiating bodies, in this case the Earth's surface and the adjacent atmosphere at nearly the same temperature, the two radiation fields interact such that the net energy transfer is the vector sum of the Poynting Vectors over all the wavelengths.

These stem from a diversity of site - specific conditions, including, but not limited to: local vegetation; presence of building structures and contributions made by such structures involving energy use, heating and air conditioning, etc; exposure to winds, the wind velocities determined by climatic factors and also whether certain wind directions are more favored than others by terrain or the presence or absence thereof to bodies of water; proximity to grass, asphalt, concrete or other material surfaces; the physical conditions of the CRS itself which include: the exact location of the temperature sensors within it, the degree of unimpeded flow of external air through the CRS, the character of the paint used; the exact height of the instrument above the external surface (noting that when the ground is covered by 3 feet of snow, the temperature instrument is about 60 % closer to, or less than 2 feet, above an excellent radiating surface, much closer than it would be under snow - free conditions).

One who at rest produces 100 W through his metabolism, but radiates over 500 W from his body surface?

This 3.7 W / m ^ 2 is captured by the atmosphere, which radiates it, as a grey body, radiates it in all directions so that half is radiated to the surface and half into space.

Excluding the absorbed part from the sky, which maybe you dispute anyway, the emission is hundreds of W / m2, as would be expected for a water surface radiating almost like a black body.

Radiation comes in from the sun (solar radiation at short wavelengths), and every body radiates according to its temperature (proportional to the fourth power of absolute temperature), so that on Earth we, and the surface and atmosphere radiate at infrared wavelengths.

The point is not about comparing (1) the heat conserving power of CO2 as a «radiating body» (the main beef of the «greenhouse theory») to the insulating power of a metal coated surface but to (2) the heat losing power of CO2 by conduction.

Thus, if the base black body radiates 235 watts per square meter and sized to be 1 square meter and the shell is sized to be 2 square meters on the interior surface, then the shell would be radiating 117.5 watts per meter squared from it's surface, but that gets concentrated to 235 watts when it finally reaches the surface of the base black body sphere.

As a result of (2) and at equilibrium all of the thermal energy of the Earth's surface would have to be radiated directly into space by the black body Earth itself.

«The Stefan — Boltzmann law states that the total energy radiated per unit surface area of a black body across all wavelengths per unit time (also known as the black - body radiant emittance or radiant exitance) is directly proportional to the fourth power of the black body's thermodynamic temperature».

I'd say that it is also possible to arrive at the temperature difference between the black body radiating temperature and the average surface temperature without any recourse to radiant heating (adiabatic compression by gravity) and same for the surface temperature on the surface of venus.

... bodies situated on or near to the surface of the earth become, under certain circumstances, colder than the neighbouring air, by radiating more heat to the heavens than they receive in every way...

The measured radiative spetrum of the Earth's thermal radiation demonstratesm that the spectrum closely approximates that of a black body with an absolute temperature of the radiating part of the Earth's surface being measured.

The Planck response applies to a radiating body with a single distinct surface.

... similarly dense clouds, if very high, though they equally intercept the communication of the earth with the sky, yet being, from their elevated situation, colder than the earth, will radiate to it less heat than they receive from it, and may, consequently, admit of bodies on its surface becoming several degrees colder than the air.

So the atmosphere does radiate a black body like thermal spectrum, and the presence of the gHG molecules simply means that there will be bands of that continuum emission, that are also captured by the GHG molecules, as well as the emissions from the surface.

And restricting the surface from radiating, or returning a portion of that emission back to it, causes the body to cool slower.