explanation of the thermodynamic diagram are given. Some discussion of errors and a table of references concludes the explanations. This is followed by the business end of each article which contains a thermodynamic diagram and tables of entropy, specific heat, enthalpy, volume, fugacity/pressure ratios and the Joule-Thomson coefficients all in metric units. For methane the pressure range covered is l-1000 atm., the temuerature range 130470°K.
For ethane the pressure range is l-500 atm, the temperature range 200-500°K. For nitrogen the pressure range is l-10,000 atm, and the' temperature range 8&7OO"K.
This book is unquestionably valuable as a source of authoritative data. It provides a coherent body of critically examined information available up to 1957-58. Some of the calculations may require slight revision as new experimental findings become available, but the great bulk of the material should remain unassailable.
There are a few points of general presentation which might be made. There is some inconsistency in the definition of the ice noint which is stated to be 273.15°K in one chaoter and 273.16"K in another.
In the presentation of data for critical properties, triple points etc., no distinction is made in tables between literature values which are measurements and those which are selections, the reader may get a slightly mistaken weight for certain values.
Use is made of enthalpy units in cal/mole in the tables of one chapter and in J/mole in another. No attempt is made to facilitate conversion to practical engineering units.
Practically no attention has been given to accurate low pressure gas p, v, T data which exist in the literature.
Nevertheless the book will be of great value to all chemical engineers concerned with industrial gases and the conception of this series of volumes is a considerable step forward in making valuable thermodynamic data readily available for practical purposes.
J. C. MCCOUBREY