Volume 1

A system of chemistry...In four volumes / By J. Murray.

  • John Murray
Date:
1809
Catalogue details

Licence: Public Domain Mark

Credit: A system of chemistry...In four volumes / By J. Murray. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

    710/748 (page 688)
    K all its forms tlie capacity is gradually enlarged as the tempera- lure is raised. We know it to be so in the aeriform state ; and both from analogy, and from the consideration of what proba- bly is the effect of expansion on capacity, it may be inferred^ as I have already stated (p. 371.), that it is likewise the caj in the liquid and solid states. On this assumption, and on the supposition that the absolute quantity of caloric in a body is the same as its specific caloric, its relation to this form will be represented by. the following modification of the preceding dia- gram *. The line AD will represent the scale of temperature from the zero A ta a certain tem- perature above that at which the body passes into vapour, C being the point at which it suffers this change, and B the point at which it becomes fluidthe progressive augmentation of capacity which the solid suffers in the rise of its temperature from the zero to its melting point, will be represented by the line NE, (AN represent- ing its capacity at zero), and the quantity of caloric which it con- tains at that point, being still solid, by the rectangle B F. The increase of capacity which hap- pens at its fusion, will be represented by the Hne E G, and the whole capacity by the line B G ; the quantity of caloric absorb- ed, by the rectangle G F, and the whole quantity of caloric the fluid contains at the temperature at which it has become fluid, by the rectangle G A. The gradual augmentation of capacity in the J^uicl, as its temperature is raised, will again be * In this diagram it is assumed, that the augmentations of capacity, as the temperature rises, are regular, except where the changes of form take place, while it is not improbable but that they may be irregular. It is obvious, that any possible irregularity of this ]dnd might be represented, by adapting to it, whatever it might be, the lines N E, G H, I K.