A text-book of electro-chemistry by unknow

Author:unknow
Language: eng
Format: epub
Tags: Electrochemistry
Publisher: New York, The Macmillan company; London, The Macmillan co., ltd.
Published: 1907-03-25T05:00:00+00:00

Fia. di

W^pCdv.

Digitized by L3OOQ1C

A TEXT-BOOK OF ELECTRO-CHBMISTRY

Expressed in words^ the total work is equal to p times the sum of these infinitely small volumes dv from the value v to that of t;'. Consequently

Attention is here called to page 4 of the introduction, where it is shown that the product pvy and therefore p{v' — v) or pv", represents

a quantity of work [and also to Figure 35, which is a graphical representation of the relation of p, v' — V, and TT].

In the case now to be consid-eredy the relations are not quite so simple, since the pressure, instead of remaining constant as in the above case, continually changes with the volume until it reaches the value p'. We have not th^n merely to add together the values of dv; the sum of the endless number of infinitely small quantities of work pdv must be found, where the value of j? is no longer a constant but a function of v, or in other words, where the value of p depends upon and varies with the value of v. The quantity of work involved during the change in volume and pressure of the perfect gas is given by the equation,

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