Elementary Hydrostatics: With Numerous Examples
Elementary Hydrostatics: With Numerous Examples
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The quantity of heat which becomes latent in the passage of an inelastic fluid into the gaseous state is very great, all of which is absorbed by the vapour at the moment of its generation either from its parent fluid or from any solid P. H. 9 130 MIXTURE OF GASES.
body with which it may then be in contact, such as would be the case if the evaporating liquid were percolating any sub- stance. The vapour and liquid, like all bodies which are in contact, and which readily impart heat to each other,... are always of the same temperature^ and therefore during the evaporation, if no extraneous heat be supplied them, they will both gradually cool, and thus, if the pressure above the liquid be diminished sufficiently to keep it boiling notwithstanding the lowered temperature, a freezing of the liquid will actually be the result of its boiling.
With the aid of the air-pump many experiments may be made to shew this remarkable phenomenon : but perhaps the most instructive of all is the following : If two bulbs of glass be connected by a bent tube and one be filled with water and then heated so that the vapour rises sufficiently to drive all air out of the tube through an orifice in the empty bowl, and if this orifice be then closed, the pressure of the included steam will after cooling be reduced to that which is due to the temperature of the air : if now the empty bulb be immersed in a freezing mixture the steam will have its pressure so di- minished that the water in the other bulb will immediately boil very rapidly, and the consequent vapour will carry off from it to the freezing mixture enough latent heat to convert the remaining water into ice : this apparatus was invente4 by Wollaston, and called by him the Cryophorus, or frost-bearer.
What to read after Elementary Hydrostatics: With Numerous Examples?
You can find similar books in the "Read Also" column, or choose other free books by John B John Budd Phear to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The quantity of heat which becomes latent in the passage of an inelastic fluid into the gaseous state is very great, all of which is absorbed by the vapour at the moment of its generation either from its parent fluid or from any solid P. H. 9 130 MIXTURE OF GASES.
body with which it may then be in contact, such as would be the case if the evaporating liquid were percolating any sub- stance. The vapour and liquid, like all bodies which are in contact, and which readily impart heat to each other,... are always of the same temperature^ and therefore during the evaporation, if no extraneous heat be supplied them, they will both gradually cool, and thus, if the pressure above the liquid be diminished sufficiently to keep it boiling notwithstanding the lowered temperature, a freezing of the liquid will actually be the result of its boiling.
With the aid of the air-pump many experiments may be made to shew this remarkable phenomenon : but perhaps the most instructive of all is the following : If two bulbs of glass be connected by a bent tube and one be filled with water and then heated so that the vapour rises sufficiently to drive all air out of the tube through an orifice in the empty bowl, and if this orifice be then closed, the pressure of the included steam will after cooling be reduced to that which is due to the temperature of the air : if now the empty bulb be immersed in a freezing mixture the steam will have its pressure so di- minished that the water in the other bulb will immediately boil very rapidly, and the consequent vapour will carry off from it to the freezing mixture enough latent heat to convert the remaining water into ice : this apparatus was invente4 by Wollaston, and called by him the Cryophorus, or frost-bearer.
What to read after Elementary Hydrostatics: With Numerous Examples?
You can find similar books in the "Read Also" column, or choose other free books by John B John Budd Phear to read onlineMoreLess
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