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Section 5 - Weight, Density and Specific Gravity
Gemology Foundation
5
Geology
Post-Graduate
10/23/2015
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Term
Carat
 Definition

a unit of weight for gem materials

 

1ct = 0.2g

 
Term
Density
 Definition

the weight of a material compared with its volume

 

it is defined as the mass per unit volume of a substance
Term
Relative Density
 Definition
the weight of a body compared with an equal volume of pure water
Term
Specific Gravity
 Definition

the ratio of the weight of a substance to the weight of an equal volume of water

 

SG = A/A-W

 

A = weight of the object in air

W = weight of the object in water
Term
Archimedes' Principle
 Definition
an object immersed in a fluid experiences an upward force equal to the weight of the fluid it displaces
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