Word Finder - radiation

definition

The shooting forth of anything from a point or surface, like diverging rays of light.

example

heat radiation

definition

The process of radiating waves or particles.

definition

The transfer of energy via radiation (as opposed to convection or conduction).

definition

Radioactive energy.

They got a dose of radiation poisoning.

We've gotta treat as many people as we can who are suffering from radiation poisoning.

The radiation treatments we found in the feds' storage facility worked.

At sunrise, the shortwave radiation from the Sun begins to heat the ground.

The object of all heating apparatus is the transference of heat from the fire to the various parts of the building it is intended to warm, and this transfer may be effected by radiation, by conduction or by convection.

Even so, you want to be wary of the spread of radiation in the aquifers.

The crucible was surrounded with a bad conductor of heat to minimize loss by radiation.

In the course of time the centres of radiation of all these groups had imposed upon them ornate rose dei venti, or windroses, such as may still be seen upon our compass-cards.

Ultraviolet radiation can damage both your eyes and skin; in fact, prolonged exposure to bright sunlight can cause extensive damage to the corneas and conjunctivas of the eyes.

She'd traveled nonstop, sticking to narrow country roads and the forest to avoid both people and zones marked as having any sort of radiation fallout from the nuke strikes.

The most fundamental experimental confirmation that the theory of the aether has received on the optical side in recent years has been the verification of Maxwell's proposition that radiation exerts mechanical force on a material system, on which it falls, which may be represented in all cases as the resultant of pressures operating along the rays, and of intensity equal at each point of free space to the density of radiant energy.

Of other papers in which he dealt with this and kindred branches of physics may be mentioned "Observations with a Rigid Spectroscope," "Heating of a Disc by Rapid Motion in Vacuo," "Thermal Equilibrium in an Enclosure Containing Matter in Visible Motion," and "Internal Radiation in Uniaxal Crystals."

When we are trying to bring radiation into connexion with temperature, we must therefore take a sufficiently large group of molecules and compare their average energies with the average radiation.

The surface of the calorimeter and the enclosure should be permanently blackened so as to increase the loss of heat by radiation as much as possible, as compared with the losses by convection and conduction, which are less regular.

If the vacuum jacket is silvered inside, radiation also is reduced to such an extent that, if the vacuum is really good, the external ice bath may be dispensed with for the majority of purposes.

The solar radiation on this planet is nearly insensible.

There are also other relevant links about such topics as nuclear reactors, natural nuclear reactors and background radiation.

The question arises whether in a vacuum discharge, in which only a comparatively small proportion of the molecules are affected, we are to take the average radiation of the affected portion or include the whole lot of molecules, which at any moment are not concerned in the discharge at all.

As there is undoubtedly a connexion between thermal motion and radiation, the energy of these electrons within the atom must be supposed to increase with temperature.

This is consistent with Kirchhoff's law and shows that the sodium in a flame possesses the same relative radiation and absorption as sodium vapour heated thermally to the temperature of the flames.

With a guess at the specific heat we might then calculate the maximum temperature to which the substance might be raised, if there were no loss by radiation or otherwise.

Generally speaking, the radiation is not simple.

The conductivity probably changes with temperature in the same way, being proportional to the product of the viscosity and the specific heat; but the experimental investigation presents difficulties on account of the necessity of eliminating the effects of radiation and convection, and the results of different observers often differ considerably from theory and from each other.

Special Observations Were Made To Determine The Corrections For The Heat Supplied By Stirring, And That Lost By Radiation, Each Of Which Amounted To About To% Of The Heatsupply.

Note, no sensing of UV or of ionizing radiation.

The UV index is a way of indicating how strong the sun's harmful rays (radiation) are at various times of the day.

This is a great bonus in addition to keeping the eyes safe from the ultra violet radiation.

Other sources of ultraviolet radiation come from black-lights, fluorescent lamps, arc lamps (unfiltered) that utilize various elements such as mercury or xenon, and tungsten-halogen incandescent lamps.

Photochromic Lenses protect the eyes from glare and UV radiation as well as bright sunlight.

Generally the preferred choice of athletes, polycarbonate lenses protect from UV radiation; moreover, these lenses are such a stalwart defense that they can protect the eyes from physical injuries during sports.

His definitely expressed view was that psychical activity is " nothing but a radiation through the cells of the grey substance of the brain of a motion set up by external stimuli."

Increased direct effect of solar radiation compensates for the cold of the nights, and in the few spots where plants have been found in flower up to a height of 12,000 ft., nothing has indicated that the processes of vegetation were arrested by the severe cold which they must sometimes endure.

Any contrivance that serves to interrupt radiation, though it may not keep the temperature much above freezing, will be found sufficient.

In the Bessemer process, and indeed in most high-temperature processes, to operate on a large scale has, in addition to the usual economies which it offers in other industries, a special one, arising from the fact that from a large hot furnace or hot mass in general a very much smaller proportion of its heat dissipates through radiation and like causes than from a smaller body, just as a thin red-hot wire cools in the air much faster than a thick bar equally hot.

Becquerel's observation in 1896 that certain uranium preparations emitted a radiation resembling the X rays observed by Rntgen in 1895.

It also includes diffusion of heat by internal radiation, which must occur in transparent substances.

In measuring conduction of heat in fluids, it is possible to some extent to eliminate the effects of molar convection or mixing, but it would not be possible to distinguish between diffusion, or internal radiation, and conduction.

Weber's hypothesis of electric atoms, capable of diffusing through metallic bodies and conductors of electricity, but capable of vibration only in non-conductors, it is possible that the ultimate mechanism of conduction may be reduced in all cases to that of diffusion in metallic bodies or internal radiation in dielectrics.

The equation of the method is the same as that for the linear flow with the addition of a small term representing the radiation loss.

When covered pans are used, the loss of heat by radiation is less, and the salt made is also cleaner.

The line of permanent snow is much higher on the plateau side in both ranges, the precipitation being greater on the outer sides - those facing the forested lowlands - and the terrestrial radiation being greater from the barren surfaces of the plateau.

The relative humidity of the air along the shores of the Gulf is high, so that exposure to the direct and reflected rays of the sun and radiation from the hot soil are encountered in a moist atmosphere.

In the second zone the climate is more temperate and there is considerable variation in temperature owing to nocturnal radiation.

In any case, it is desirable to diminish the loss of heat as much as possible by polishing the exterior of the calorimeter to diminish radiation, and by suspending it by non-conducting supports, inside a polished case, to protect it from draughts.

As the method is usually practised, the calorimeter is made very small, and the surface is highly polished to diminish radiation.

If Hdo Is The Radiation Loss In Watts We Have The Equation, Ec=Jsqdo Hdo.

It was shown by Homer Lane that a mass of gas held in equilibrium by the mutual gravitation of its parts actually grows hotter through radiating heat; the heat gained by the resulting contraction more than counterbalances that lost by radiation.

C. Rntgen of Munich made in 1896 his remarkable discovery of the so-called X or Rntgen rays, a class of radiation produced by the impact of the cathode particles against an impervious metallic screen or anticathode placed in the vacuum tube.

These yielded a remarkable extension of Pierre Provost's "Law of Exchanges," and enabled him to establish the fact that radiation is not a surface phenomenon, but takes place throughout the interior of the radiating body, and that the radiative and absorptive powers of a substance must be equal, not only for the radiation as a whole, but also for every constituent of it.

When a patient is covered with several blankets, loss of heat from the surface both by radiation and evaporation is to a great extent prevented, but if a cradle be placed over him, so as to raise the bedclothes and allow of free circulation of air around his body, both radiation and evaporation will be increased and the temperature consequently lowered.