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level: Heavy liquids and SG

Questions and Answers List

Question	Answer
The hydrostatic method of measuring gemstone weight is based on which principle?	Archimedes
What is the name of the principle that states that an object totally immersed in fluid experiences an upwards force equal to the weight of the fluid it replaces?	Archimedes
The hydrostatic method gives an accurate result of gemstone weight for all gemstones except what?	Anything under 1ct
Using the formula for specific gravity below, what would the SG be of the following object weighed using the hydrostatic method, if the weight in air is 26.5g, and the weight in water is 16.5g?	2.65
What type of water is best used for immersion on weighing scales to reduce the number of bubbles forming on the surface of the stone?	Distilled
What type of liquids can be used in labratories to weigh gemstones too small to be weighed using the hydrostatic method?	High density
What is the name of two heavy liquids most commonly used for laboratory weighing of gemstones	Di-iodomethane
What will happen to a gemstone if it is tested within a liquid that has a greater SG than the stone?	It will float
What will happen to a gemstone if it is tested within a liquid that has a lower SG than the stone?	It will sink
What will happen to a gemstone that is tested in a high density liquid with a similar SG to the gemstone?	It will remain suspended