Chapter 7 Notes

# Chapter 7 Notes - Chapter 7 Notes Definitions The...

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online