This handbook provides data on more than 4000 substances, ions, and radicals chosen with regard for their industrial and scientific importance. It consists of six sections arranged in tabulated form. The first section gives the formulas and names of substances, their relative molecular masses and important physical properties, such as phase-transition temperature, aggregate state, and density, along with data on substance reactivity (chemical properties) with respect to the most commonly used solutions and reagents (water, ethanol, hydrochloric, sulfuric, and nitric acids, sodium hydroxide, and ammonia hydrate). The entries that describe naturally occurring substances include their mineralogical names, symmetry, and hardness. There is also data on the relative atomic masses of elements, properties of natural and radioactive isotopes, electronic configurations of atoms, energies of ionization, and affinities to electrons for atoms and molecules, binding energies and bond lengths, structure (geometric form) of constituent molecules and ions of various substances, including coordination compounds. The handbook also lists the thermodynamic constants of the substances in all their aggregate states (gas, liquid, solid state, aqueous solution), redox potentials, acidity and basicity constants, stability constants of complexes in aqueous solution, and solubility in water.
During the past decade there have been many changes in the perfumery industry which are not so much due to the discovery and application of new raw materials, but rather to the astronomic increase in the cost of labour required to produce them. This is reflected more particularly in the flower industry, where the cost of collecting the blossoms delivered to the factories has gone up year after year, so much so that most flowers with the possible exception of Mimosa, have reached a cost price which has compelled the perfumer to either reduce his purchases of absolutes and concretes, or alternatively to substitute them from a cheaper source, or even to discontinue their use. This development raises an important and almost insoluble problem for the perfumer, who is faced with the necessity of trying to keep unchanged the bouquet of his fragrances, and moreover, to ensure no loss of strength and diffusiveness. Of course, this problem applies more especially to the adjustment of formulae for established perfumes, because in every new creation the present high cost of raw materials receives imperative con- sideration before the formula is approved.
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