AN EQUATION IS PROPOSED TO CALCULATE THE Surface Tension OF BINARY LIQUID SOLUTIONS. ACCORDING TO THIS EQUATION THE Surface Tension OF THE SOLUTION IS RELATED TO THE Surface Tension OF THE PURE COMPONENTS, THE THICKNESS OF THE Surface REGION AND THE MOLECULAR AREA OF THE CAPILLARY-ACTIVE COMPONENT. THE METHOD IS APPLICABLE TO SYSTEMS COMPRISING COMPONENTS OF WIDELY DIFFERENT MOLECULAR SIZES AND THE FULL MOLE FRACTION RANGE. EXCELLENT RESULTS FOR THE Surface Tension OF BINARY SYSTEMS IN AQUEOUS AND NON-AQUEOUS MEDIA HAVE BEEN OBTAINED. (Surface Tension, COMPOSITION) DATA FOR 30 DIFFERENT TYPES OF SYSTEMS WITH ABOUT 300 DATA POINTS CAN BE CALCULATED BY THE EQUATION WITH AN AVERAGE PERCENT DEVIATION OF ABOUT 0.8%. THUS AGREEMENT BETWEEN THE PREDICTED AND EXPERIMENTAL Surface Tension IS FOUND TO BE GOOD FOR MANY OF THESE SYSTEMS CONSIDERING THE SIMPLICITY OF THE MODEL.

AN EXPRESSION FOR THE Surface Tension AND ISOTHERMAL COMPRESSIBILITY, DERIVED FROM SCALED PARTICLE THEORY (SPT), ARE USED TO PREDICT Surface Tension OF PURE SUBSTANCES FROM COMPRESSIBILITY DATA, AND VICE VERSA. A RELATION BETWEEN Surface Tension AND COMPRESSIBILITY IS OBTAINED BY MULTIPLYING THE EXPRESSIONS FOR Surface Tension AND COMPRESSIBILITY. THIS RELATIONSHIP IS DEPENDENT ONLY ON THE LIQUID DENSITY AND ON THE DIAMETER OF THE MOLECULAR COMPOUNDS. DIAMETERS ARE CALCULATED READILY FROM EITHER THE Surface Tension OR COMPRESSIBILITY EXPERIMENTAL DATA. THE VALIDITY OF THESE EXPRESSIONS IS TESTED FOR SEVERAL TYPES OF PURE SUBSTANCES: SATURATED HYDROCARBONS, HALOGENATED HYDROCARBONS, ALCOHOLS, AROMATIC HYDROCARBONS AND THEIR NITROGEN CONTAINING DERIVATIVES, OXYGEN CONTAINING ORGANIC COMPOUNDS, SIMPLE POLYATOMIC COMPOUNDS AND ELEMENTS. THE EXPRESSIONS PREDICT WELL IN MOST CASES. GENERALLY, LIQUIDS COMPOSED OF MOLECULES MOST CLOSELY APPROXIMATING SPHERICAL INTERMOLECULAR POTENTIALS EXHIBIT THE BEST CORRELATION WITH THE Surface Tension-COMPRESSIBILITY RELATION. GIVEN THE GOOD AGREEMENT, AN APPROACH IS SUGGESTED FOR USING Surface Tension DATA TO COMPUTE LIQUID PHYSICAL PROPERTIES AND THERMODYNAMIC VALUES THAT CAN BE OBTAINED FROM AN EQUATION OF STATE.

THIS PAPER IS AIMED AT ELUCIDATING HOW THE EQUATION OF STATE BY SONG AND MASON [1] CAN BE USED WITH EVEN LESS INPUT INFORMATION FOR METALS OVER A WIDE RANGE OF TEMPERATURES AND PRESSURES. IN PARTICULAR, KNOWLEDGE OF ONLY TWO CONSTANT, Surface Tension AND THE LIQUID DENSITY AT MELTING POINT AS SCALING PARAMETERS WHICH, AS WE WILL SHOW, CAN CORRELATE AND PREDICT THE THERMO PHYSICAL BEHAVIOR OF METALS OVER A WIDE RANGE OF TEMPERATURES AND PRESSURES...

A GREAT PART OF THEORETICAL AND EXPERIMENTAL STUDYING OF Surface Tension OF SOLUTIONS IS RELATED TO Surface Tension AND Surface PROPERTIES OF ORGANIC BINARY MIXTURES AND HAS RECEIVED INCREASING ATTENTION IN THE DIFFERENT SCIENTIFIC RESEARCH FIELDS. SEVERAL THEORETICAL APPROACHES SUCH AS CLASSICAL THERMODYNAMIC THEORIES [1]...