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Specific gravity

About: Specific gravity is a research topic. Over the lifetime, 1534 publications have been published within this topic receiving 13141 citations.


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18 Dec 2020
TL;DR: In this article, the purity of glacial acetic acid is best determined by specific gravity and freezing-point, and the following values taken from their figures may be used for interpolation.
Abstract: Although the percentage of total acid present may be determined by direct titration with N alkali to phenolphthalein, 1 ml N = 0.06005 g, the purity of glacial acetic acid is best determined by specific gravity and freezing-point. All likely impurities cause a lowering of both freezing-point and specific gravity, with the exception of small percentages of water which have the effect of raising the specific gravity of concentrated acetic acid. Richmond and England1 constructed tables correlating these constants with percentages of acid, and the following values taken from their figures may be used for interpolation.

400 citations

Journal ArticleDOI
TL;DR: The recommended properties of the rice straw-wood particle composite boards are described, to absorb noises, preserve the temperature of indoor living spaces, and to be able to partially or completely substitute for wood particleboard and insulation board in wooden constructions.

334 citations

Journal ArticleDOI
TL;DR: It is experimentally proved that certain volume expansion of steel slag can be absorbed internally by the void volume in bulksteel slag under external surcharge weight making the apparent volume expansion equal zero.

282 citations

Journal ArticleDOI
TL;DR: An automated technique was developed for the laboratory preparation of gradient columns of specific gravity used in measurement of brain-tissue water using conversion factors derived for this purpose and applicable to studies of brain edema.
Abstract: A simple method was developed for the laboratory preparation of gradient columns of specific gravity used in measurement of brain-tissue water. By this automated technique, virtually linear and repeatable density gradients were obtained from which values of tissue specific gravity could be determined. The specific gravity of both solid and fresh cortex and white matter from adult cats was measured and converted to units of percent water per gram tissue using conversion factors derived for this purpose and applicable to studies of brain edema.

271 citations

Journal ArticleDOI
TL;DR: Existing data on the specific gravity and the water and nutrient content of microorganisms grown in shake cultures cannot be applied when quantifying the soil microbial biomass, indicating further work is necessary to obtain accurate conversion factors between biovolume and biomass.
Abstract: Direct microscopic measurements of biomass in soil require conversion factors for calculation of the mass of microorganisms from the measured volumes These factors were determined for two bacteria, five fungi, and a yeast isolated from soil Moisture stress conditions occurring in nature were simulated by growth in two media using shake cultures, on agar plates, and on membranes held at 34, 330, and 1,390 kPa of suction The observed conversion factors, ie, the ratio between dry weight and wet volume, generally increased with increasing moisture stress The ratios for fungi ranged from 011 to 041 g/cm3 with an average of 033 g/cm3 Correction of earlier data assuming 80% water and a wet-weight specific gravity of 11 would require a conversion factor of 144 The dry-weight specific gravity of bacteria and yeasts ranged from 038 to 14 g/cm3 with an average of 08 g/cm3 These high values can only occur at 10% ash if no more than 50% of the cell is water, and a specific conversion factor to correct past data for bacterial biomass has not yet been suggested The high conversion factors for bacteria and yeast could not be explained by shrinkage of cells due to heat fixing, but shrinkage during preparation could not be completely discounted Moisture stress affected the C, N, and P content of the various organisms, with the ash contents increasing with increasing moisture stress Although further work is necessary to obtain accurate conversion factors between biovolume and biomass, especially for bacteria, this study clearly indicates that existing data on the specific gravity and the water and nutrient content of microorganisms grown in shake cultures cannot be applied when quantifying the soil microbial biomass

246 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202398
2022150
202110
202014
201925
201825