The principles of chemistry : illustrated by simple experiments / by Julius Adolph Stöckhardt ; translated form the 5th German edition by C.H. Peirce.

  • Stöckhardt, Julius Adolph, 1809-1866.
Date:
1851
Catalogue details

Licence: Public Domain Mark

Credit: The principles of chemistry : illustrated by simple experiments / by Julius Adolph Stöckhardt ; translated form the 5th German edition by C.H. Peirce. Source: Wellcome Collection.

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    the melting of snow; heat disappears, and its disap¬ pearance proceeds from the same cause in both cases; steam requires heat for its existence as such, and is so intimately combined with it that the excess is no longer perceptible, — it is latent. If water may be regarded as a combination of ice with latent heat, so steam may be considered as a combination of ice with still more latent heat; which latter becomes free again on the conversion of steam into water. 36. Experiment. — Adapt the shorter limb of a bent glass tube, by means of a perforated cork, to the neck of a flask, and pass the longer limb to the bottom of a beaker-glass or common tumbler. Pour into each of these two vessels two ounces and a half of ice-cold water, and grad¬ ually heat the glass upon a tri¬ pod until it boils. Note the time re¬ quired for this operation. Con¬ tinue the process until the water in Fig. 15. the beaker-glass begins to bubble, and note also the time, which will be found the same as that required for heating the water in the flask. The steam formed in the flask has no other outlet than through the tube into the water, where it condenses, until the contents of the second glass reach the temperature of 100° C., and boil. Both of the vessels must now be weighed; and it will be found that the flask weighs half an ounce less 4