. Elements of modern chemistry . he weight of the receiver and the condensing apparatus con-nected with it is increased by the weight of all the water formed. By subtracting the weight of the oxygen from that of thewater we find the weight of the hydrogen. By the aid of this rigorous method Dumas has found that100 parts by weight of water contain Hydrogen 11,11 Oxygen numbers are in the exact ratio of Hydrogen 1 Oxygen 8 9 WATER. 75 Physical Properties.—Pure water has neither taste norodor. It is limpid and colorless. It occurs in three states innature ; during the colds of w
. Elements of modern chemistry . he weight of the receiver and the condensing apparatus con-nected with it is increased by the weight of all the water formed. By subtracting the weight of the oxygen from that of thewater we find the weight of the hydrogen. By the aid of this rigorous method Dumas has found that100 parts by weight of water contain Hydrogen 11,11 Oxygen numbers are in the exact ratio of Hydrogen 1 Oxygen 8 9 WATER. 75 Physical Properties.—Pure water has neither taste norodor. It is limpid and colorless. It occurs in three states innature ; during the colds of winter it is solid. Ice, snow, frost,sleet, and hail are the different forms which it assumes in thisstate. The temperature at which ice melts is one of the stand-ard points in the thermometric scale. To this temperaturecorresponds the 0 of the centigrade scale, which is adopted inthis work. Snow is composed of an agglomeration of little crystals;these are hexagonal prisms, which often present the forms rep-resented in Fig. Fig. 30. At the moment of freezing, water expands, and its densityis then less than that which it possesses in the liquid density of ice is Water contracts in volume from0 to +4°, and presents its maximum density at the latter tem-perature. Its density at this point is chosen as the unit ofcomparison for the densities of solid and liquid bodies. Water and even ice are continually emitting invisible vaporswhich mix with the air, and are, as it were, dissolved in vaporization takes place more actively as the temperatureis raised. The air is said to be saturated with vapor at any given tem-perature when it refuses to take up any more vapor at thattemperature. Under these conditions, if the temperature belowered, a portion of the vapor is condensed in fine drops,which remain suspended in the air in the form of mist or visi-ble vapor. The point at which the moisture of the air is con-densed is called the dew-point. Water begins to b
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