Elements of Chemistry: Theoretical and Practical, Part 1John Wiley, 1867 |
Continguts
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Frases i termes més freqüents
absorbed acid alcohol amount of heat angles atmosphere atomic heat atomic weight axis becomes bodies boiling boiling-point bromine bulb bulk carbonic carbonic acid charge chemical action chloride colour column combination compound condensed conducting power conductor cooling copper crystal degree density diffusion effect elasticity electricity electroscope elements emitted employed equal ether evaporation exhibit expansion experiments force furnished gases glass hydrochloric acid hydrogen increases insulated intensity iron latent heat Leyden jar light lines liquid magnetic mercury metals Methyl needle nitrate nitric acid observed obtained oxide oxygen particles phosphorescence placed plane plate platinum polarized portion potassium pressure prism produced proportion quantity of heat radiation rays reflected refraction refrangibility Regnault rhombohedron rise salt shown silver sodium solid solution spark specific gravity specific heat spectrum steam substances sulphate sulphur sulphuric acid surface temperature thermometer thermoscope tion transmitted tube vapour vessel voltaic whilst wire zinc
Passatges populars
Pàgina 287 - On partially liquefying carbonic acid by pressure alone, and gradually raising at the same time the temperature to 88° F., the surface of demarcation between the liquid and gas became fainter, lost its curvature, and at last disappeared. The space was then occupied by a homogeneous fluid, which exhibited, when the pressure was suddenly diminished or the temperature slightly lowered, a peculiar appearance of moving or flickering striae throughout its entire mass.
Pàgina 185 - It seems possible to account for all the phenomena of heat, if it be supposed that in solids the particles are in a constant state of vibratory motion, the particles of the hottest bodies moving with the greatest velocity...
Pàgina 147 - For instance, the orange ray may be the effect of the strontia, since Mr. Herschel found in the flame of muriate of strontia a ray of that colour. If this opinion should be correct, and applicable to the other definite rays, a glance at the prismatic spectrum of a flame may show it to contain substances which it would otherwise require a laborious chemical analysis to detect.
Pàgina 196 - ... with it, which moves upon the face of the arc, and subdivides the former graduation into minutes of a degree ; the other end crosses the centre, and terminates in an obtuse steel point, turned inwards at a right angle.
Pàgina 367 - F, a communication be established between the two vessels, part of the current will pass through this wire and return to the pile. The quantity of electricity circulating in the galvanometer will be thus diminished, and with it the deflection of the needle. Suppose, then, that by this artifice we have reduced the galvanometric deviation to its fourth or fifth part ; in other words, supposing that the needle being at 10 or 12 degrees, under the action of a constant source of heat, placed at a fixed...
Pàgina 146 - The colours thus communicated by the different bases to flame afford, in many cases, a ready and neat way of detecting extremely minute quantities of them...
Pàgina 353 - ... inch above the other ; discharge a large jar through the card. It will be perforated opposite the wire attached to the negative coating, and an irregular dark line of reduced mercury will be found extending on the positive side to the point of the positive wire. If the experiment be made in vacuo, the perforation will be formed midway between the two wires. The distinction between positive and negative electricity is also beautifully shown by what are termed Lichtenberg's figures, which may be...
Pàgina 287 - ... liquefaction of carbon dioxide or separation into two distinct forms of matter can be effected, even under a pressure of 300 or 400 atmospheres. Similar results are obtained with nitrous oxide. It appears indeed that there exists for every liquid a temperature, called by Andrews the
Pàgina 179 - Substances are said to be optically active when they produce rotation of the plane of polarisation of a ray of polarised light which passes through them. The rotation may be either to the right or to the left, according to the nature of the substance ; in the former case the substance is said to be dextro-rotatory ; in the latter, Izvo-rotatory.
Pàgina 368 - The other forces are easily obtained by the proportions : — 1-5 : 5=a : x=— a=3-333 a 1*5 (that is to say, one reduced current is to the total current to which it corresponds, as any other reduced current is to its corresponding total current), where a represents the deflection when the exterior circuit is closed.