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Nitrogen :: Nitrogen (n.) A colorless nonmetallic element, tasteless and odorless, comprising four fifths of the atmosphere by volume. It is chemically very inert in the free state, and as such is incapable of supporting life (hence the name azote still used by French chemists); but it forms many important compounds, as ammonia, nitric acid, the cyanides, etc, and is a constituent of all organized living tissues, animal or vegetable. Symbol N. Atomic weight 14. It was formerly regarded as a permanent noncon

Symplectic :: Sympiesometer (n.) A sensitive kind of barometer, in which the pressure of the atmosphere, acting upon a liquid, as oil, in the lower portion of the instrument, compresses an elastic gas in the upper part..

Moist :: Moist (a.) Moderately wet; damp; humid; not dry; as, a moist atmosphere or air..

Misty :: Misty (superl.) Accompained with mist; characterized by the presence of mist; obscured by, or overspread with, mist; as, misty weather; misty mountains; a misty atmosphere..

Volatile :: Volatile (a.) Passing through the air on wings, or by the buoyant force of the atmosphere; flying; having the power to fly..

Halo :: Halo (n.) A luminous circle, usually prismatically colored, round the sun or moon, and supposed to be caused by the refraction of light through crystals of ice in the atmosphere. Connected with halos there are often white bands, crosses, or arches, resulting from the same atmospheric conditions..

Hyperborean :: Hyperborean (a.) Northern; belonging to, or inhabiting, a region in very far north; most northern; hence, very cold; fright, as, a hyperborean coast or atmosphere..

Siphon :: Siphon (n.) A device, consisting of a pipe or tube bent so as to form two branches or legs of unequal length, by which a liquid can be transferred to a lower level, as from one vessel to another, over an intermediate elevation, by the action of the pressure of the atmosphere in forcing the liquid up the shorter branch of the pipe immersed in it, while the continued excess of weight of the liquid in the longer branch (when once filled) causes a continuous flow. The flow takes place only when the

Psychrometer :: Psychrometer (n.) An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer..

Ethereal :: Ethereal (a.) Pertaining to the hypothetical upper, purer air, or to the higher regions beyond the earth or beyond the atmosphere; celestial; as, ethereal space; ethereal regions..

Vacuum :: Vacuum (n.) The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch..

Hygroscopic :: Hygroscopic (a.) Having the property of readily inbibing moisture from the atmosphere, or of the becoming coated with a thin film of moisture, as glass, etc..

Storm :: Storm (n.) A violent disturbance of the atmosphere, attended by wind, rain, snow, hail, or thunder and lightning; hence, often, a heavy fall of rain, snow, or hail, whether accompanied with wind or not..

Corona :: Corona (n.) A circle, usually colored, seen in peculiar states of the atmosphere around and close to a luminous body, as the sun or moon..

Dasymeter :: Dasymeter (n.) An instrument for testing the density of gases, consisting of a thin glass globe, which is weighed in the gas or gases, and then in an atmosphere of known density..

Twilight :: Twilight (n.) The light perceived before the rising, and after the setting, of the sun, or when the sun is less than 18? below the horizon, occasioned by the illumination of the earth's atmosphere by the direct rays of the sun and their reflection on the earth..

Atmosphere :: Atmosphere (n.) A supposed medium around various bodies; as, electrical atmosphere, a medium formerly supposed to surround electrical bodies..

Oxygen :: Oxygen (n.) A colorless, tasteless, odorless, gaseous element occurring in the free state in the atmosphere, of which it forms about 23 per cent by weight and about 21 per cent by volume, being slightly heavier than nitrogen. Symbol O. Atomic weight 15.96..

Aerography :: Aerography (n.) A description of the air or atmosphere; aerology.

Hygrometry :: Hygrometry (n.) That branch of physics which relates to the determination of the humidity of bodies, particularly of the atmosphere, with the theory and use of the instruments constructed for this purpose..

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