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Diposting di oleh Kingjy

To determine the relative density of gemstones is to use Archimedes’ principle, and a precise balance can be used to determine the quality of gemstones and the buoyancy experienced. Misalnya, if a gemstone with unknown name has a mass of 5.2 grams in the air and 3.3 grams in water, its buoyancy is 5.2 grams-3.3 grams-1.9 grams. According to the Archimedes principle: when an object When part or all of the jewel is immersed in the liquid, the upward thrust acting on the object is equal to the mass of the liquid being discharged. The volume of the gemstone can be calculated to be 1.9 cm, then the density of the gemstone = 5.2 g/1.9 cm3≈2.74 g/cm , It is known that the relative density of this gem is 2.74, yaitu, the mass of the gem is 22.74 times of the same volume of water. Using similar equipment, the quality of gems in pure water can be measured. In order to determine the relative density of gemstones, the most convenient method is to use heavy liquids (Heavy Lquids), the most commonly used heavy liquids are as follows: tribromomethane (CHBr,), relative density of 0.82, slightly yellow liquid; Methyl iodide (CH212), the relative density is 3.32, yellow liquid. It is quite simple to test the relative density of gemstones with heavy liquid. Put gemstones into heavy liquid, those with a relative density lower than the heavy liquid will float; those with a relative density greater than the heavy liquid will sink; and those with relative density and heavy liquid will remain in a state of neither floating nor sinking. Misalnya, use Thoulet liquid with a relative density of 3.20 to determine the relative density of gemstones. The emerald with a relative density of 2.78 is floating, the tourmaline with a relative density of 3.20 is neither floating nor sinking, and the see-through stone with a relative density of 3.65 is sinking.

 

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