Bright meteors often emit the bluish-white light suggestive of burning magnesium.
In the not too distant future, tiny robots will detect pests on produce and emit a signal to shoo them away.
As soon as a spark-gap was introduced, or the condenser began to emit the humming sound peculiar to it, the beautiful blue glow so characteristic of argon immediately appeared.
All poets and heroes, like Memnon, are the children of Aurora, and emit their music at sunrise.
The flames of chlorine in hydrogen) do not apparently emit the usual sodium radiation when a sodium salt is placed in them.
The well-known "fire-flies" of the tropics are large click-beetles (Elateridae), that emit light from paired spots on the prothorax and from the base of the ventral abdominal region.
Prairie fires or spontaneous combustion have ignited many coal seams. Some have already burnt out; others still emit smoke and sulphurous fumes from the crevices in the hillsides, and through the fissures may be seen the glowing coal and rock.
Young foxes can be tamed to a certain extent, and do not then emit the well-known odour to any great degree unless excited.
Their colour is usually some tone of yellow with dashes of red, brown and green, and they frequently emit a pungent odour.
They are all, as found in commerce, of a pale yellow-green colour; they emit a peculiar aromatic odour, and have a slightly astringent bitter taste.
In many cases the slimy masses of spermatia (Uredineae), conidia (Claviceps), basidiospores (Phallus, Coprinus), &c., emit more or less powerful odours, which attract flies or other insects, and it has been shown that bees carry the flagrant oidia of Sclerotinia to the stigma of Vaccinium and infect it, and that flies carry away the foetid spores of Phallus, just as pollen is dispersed by such insects.
We thus see that radium is continually losing matter and energy as electricity; it is also losing energy as heat, for, as was observed by Curie and Laborde, the temperature of a radium salt is always a degree or two above that of the atmosphere, and they estimated that a gramme of pure radium would emit about 100 gramme-calories per hour.
The only noise the Tasmanian wombat makes is a low hissing, but the hairy-nosed wombat is said to emit a short quick grunt when annoyed.
A dissolved in B and B dissolved in A, since both of these solutions emit vapours of the same composition (this follows since the same vapour must be in equilibrium with both solutions, for if it were not so a cyclic system contradicting the second law of thermodynamics would be realizable).
So long as bodies are in the solid state the light which they emit, though different in.
When two sources emit only pure tones we might expect that we should have no dissonance when, as in the major seventh, the beat frequency is greater than the range of harshness.
This is effected by raising up a small mound of rich compost around it, a contrivance which induces the graft to emit roots into the surface soil.
But all such bodies appear to lose their distinctive properties when heated in a vessel which nearly encloses them, for in that case those radiations which they do not emit are either transmitted through them from the walls of the vessel behind, or else reflected from their surface.
This phenomenon is connected with the fact that incandescent bodies, especially in rarefied gases, throw off or emit electrons or gaseous negative ions.
Some beetles emit a bright light from a portion of their bodies, which leads to the recognition of mate or comrade by sight.
All bodies when heated emit the same kind of radiations which they absorb - an important principle known as the principle of the equality of radiating and absorbing powers.
Our knowledge of these bodies is of necessity derived through the medium of the light which they emit; and it is the development and applications of the laws of light which have made possible the additions to our stock of such knowledge since the middle of the 19th century.