Specific gravity and their determination

Densimeters Devices for measuring densities. See under DENSITY SPECIFIC GRAVITY AND THEIR DETERMINATIONS... 

DENSITY SPECIFIC GRAVITY AND THEIR DETERMINATIONS (Densite in Fr Dichte in Ge Densita in Ital Densidad in Span Plotnost in Rus).Density abbr d) is the mass per unit volume of a substance at a defined temperature This physical property might serve for identification of various materials (including expls propints)... 

Specific Gravity. See under Density and Specific Gravity and their Determinations in Vol 3, D64-Rto D85-L... 

The properties of a phase are either intensive or extensive. An intensive property is one which is independent of the total quantity of matter in the system. Examples are density, specific gravity, and specific heat. Properties such as the mass and volume of a system are termed extensive properties since their value is determined by the quantity of matter contained in the system. 

The monomers flown on all three missions consisted of those that were completely miscible with one another as well as those which demonstrated extensive immiscibility. The miscible systems were assembled for their previously demonstrated permeability to atmospheric gases. This was in keeping with the original intent of the project and the objective of our commercial partner. Paragon Optical. In addition some of the monomeric mixtures were modified to contain metal atoms which would be incorporated into the polymer. The latter was an effort to enhance the permeability of the materials to specific gases and to determine the effect of low-gravity on the distribution of the atoms within the polymeric material. In STS-57, we observed that the immiscible... 

The value of fractional distillation in the examination of essential oils cannot be overestimated. The various fractions may be examined and their specific gravities, optical rotations, and refractive indices determined. The combination of these figures will often give the experienced analyst the most useful information and save him many hours needless work. Experience alone, however, will teach the chemist to make the fullest use of the results so obtained. In most cases distillation under reduced pressure is necessary on account of the risk of decomposing the various constituents of the oil. The use of a Briihl receiver (or any similar contrivance), which is easily obtained from any apparatus maker. 

Many different additives, fillers, and/or reinforcements are used in plastic materials. The weight of the compounds change according to the amount included. Figure 5-3 provides a guide to determining their specific gravities. 

Many of the chemical and physical properties of mineral fillers are important in their application in thermoplastics. These include purity, specific gravity, hardness, electrical, thermal and optical properties, surface area, particle shape and size. The determination and importance of many of these has been covered in several reviews [65,66]. Only a brief coverage is given here for the less ambiguous properties such as specific gravity, hardness and standard thermal and optical properties, with most attention being concentrated on properties such as size and shape which have been found to give particular problems in measurement and interpretation. 

Estimation of the Specific Gravity of Gas.—Although the more determination of the specific gravity of gases is of very little nee as a test of their commercial value —unless the gas is to be used for aeronautic purposes —yet, as it is still much employed by gas engineers, and as such an estimation is occasionally useful for controlling the results of chemical analysis, a method by which such a determination may be made is here subjoined. 

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