Acetylene, The Principles Of Its Generation And Use by F. H. Leeds

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Acetylene, The Principles Of Its Generation And Use by F. H. Leeds
Book, page 201 / 445

differences make the solution fit for employment. It may be observed that
as the solution of acetylene in acetone is a liquid, the acetylene must
exist therein as a liquid; it is, in fact, liquid acetylene in a state of
dilution, the diluent being an exothermic and comparatively stable body.

The specific heat of acetylene is given by M. A. Morel at 0.310, though
he has not stated by whom the value was determined. For the purpose of a
calculation in Chapter III. the specific heat at constant pressure was
assumed to be 0.25, which, in the absence of precise information, appears
somewhat more probable as an approximation to the truth. The ratio
(_k_ or C_p/C_v ) of the specific heat at constant pressure to that
at constant volume has been found by Maneuvrier and Fournier to be 1.26;
but they did not measure the specific heat itself. [Footnote: The ratio
1.26 _k_ or (C_p/C_v) has been given in many text-books as the value
of the specific heat of acetylene, whereas this value should obviously be
only about one-fourth or one-fifth of 1.26.

By employing the ordinary gas laws it is possible approximately to
calculate the specific heat of acetylene from Maneuvrier and Fournier's
ratio. Taking the molecular weight of acetylene as 26, we have

26 C_p - 26 C_v = 2 cal.,

and

C_p = 1.26 C_v.

From this it follows that C_p, _i.e._, the specific heat at constant
pressure of acetylene, should be 0.373.] It will be seen that this value
for _k_ differs considerably from the corresponding ratio in the
case of air and many common gases, where it is usually 1.41; the figure
approaches more closely that given for nitrous oxide. For the specific
heat of calcium carbide Carlson quotes the following figures:

0 deg. 1000 deg. 1500 deg. 2000 deg. 2500 deg. 3000 deg. 3500 deg.
0.247 0.271 0.296 0.325 0.344 0.363 0.381

The molecular volume of acetylene is 0.8132 (oxygen = 1).

According to the international atomic weights adopted in 1908, the

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