Then, the materials being evaluated will have their densities measured at a given temperature and pressure, and will be designated with numbers less than, equal to, or greater than one depending on their density relative to the reference material. For most of the soils the value of specific gravity lies between 2.65 to 2. The specific gravity may slightly vary within a mineral because. So Specific gravity of solids, which is denoted by G or Gs, can be defined as the ratio of the unit weight of solids to the unit weight of water, which is weight of solids of a given volume, to the weight of equivalent volume of water at 4 degree centigrade. Most minerals with a metallic luster are heavy. Minerals with a specific gravity under 2 are considered light, between 2 and 4.5 average, and greater than 4.5 heavy. Once this is determined, it is assigned a specific gravity of 1. If a mineral has a specific gravity of 2.7, it is 2.7 times heavier than water. The reference material and its density must be specified at a given temperature and pressure. What is required to calculate a specific gravity is a material and its density, a reference material and its density, a temperature and a pressure. Specific gravity is a comparison of densities, and as a result no dimensions are required when evaluating and considering specific gravity. Furthermore, the specific gravity can tell us if the object will. This also means that kerosene will float on the water's surface when both are placed in a container. Liquids with a density lower than water, which includes most crude oil grades and petroleum products, will have a specific gravity between 0.0 and 1.0. Specific gravity refers to the ratio of the density of an object and the reference material. This means that kerosene has a lower density than water at that temperature. For liquids, water is usually used as the reference material.Īn example of comparing two liquids is that kerosene has a value lower than 1 compared to pure water at 40☏ (104☌) under normal atmospheric pressure. For gases, air at normal pressure and temperature is often used as the reference material. The ratio of the unfamiliar material with a more common material allows for quick comparisons in regard to density. Specific gravity (sp gr) is a ratio, expressed decimally, of the weight of a substance to the weight of an equal volume of a substance chosen as a standard. Specific gravity is an important measurement when considering the density of an unfamiliar material. Corrosionpedia Explains Specific Gravity (SP.GR)
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