Experimental Course of Physical Chemistry volume 2
Experimental Course of Physical Chemistry volume 2
James Frederick Spencer
The book Experimental Course of Physical Chemistry volume 2 was written by author James Frederick Spencer Here you can read free online of Experimental Course of Physical Chemistry volume 2 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Experimental Course of Physical Chemistry volume 2 a good or bad book?
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The silver cylinder is closed by a cork which carries two tubes, a and b, and a thermometer, t, graduated in tenth-degrees. The method consists in placing a solution or hydrate in th bottle, and evacuating as completely as possible by means of a water pump. The apparatus is then placed in a ther- mostat, and allowed to remain there for several hours. The vapour pressure is then determined by measuring the dew point. This is done by placing a quantity of ether in the silver tube and slowly blowi...ng a current of air through it until condensation of water takes place on the silver tube. The temperature at which this occurs is noted by the thermometer, t. The air current is then either stopped or reduced very much, when the tempera- ture of the silver tube slowly rises and the film of moisture disappears from the silver tube. The tem- perature at which this last trace vanishes is read, and the mean of the two temperatures, which should not differ by more than 0'2, gives the dew point. The dew point is the temperature at which the air is just saturated with aqueous vapour; the vapour pressure of water at this temperature can be found from tables (Table VII.
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