Chapter 7 Notes - Chapter 7 Notes Definitions The SG...

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Chapter 7 Notes Definitions The SG (specific gravity ) of a substance is the ratio of its weight of an identical volume of pure water Because SG is expressed as a ratio, no units of measurement are necessary The SG of diamond for example is 3.52, which indicates that diamond is 3,52 times heavier than an identical volume of water The density of a substance is defined as its weight per unit volume, and is measured not as a ratio but in units of weight and volume Relative density is a term sometimes used in connection with liquids, and like SG is the ratio between the weight of the liquid and the weight of an identical volume of water at 4 o C Archimedes’ Principle and the Measurement of SG Archimedes’ principle states that a body immersed in a fluid experiences an upward force equal to the weight of the fluid it displaces As the value of SG is a reliable constant for the majority of gemstones, it can be a useful aid in the identification of an unknown (and unmounted) specimen
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Chapter 7 Notes - Chapter 7 Notes Definitions The SG...

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