Thermodynamics: An Engineering Approach 8th Edition

Published by McGraw-Hill Education
ISBN 10: 0-07339-817-9
ISBN 13: 978-0-07339-817-4

Chapter 1 - Introduction and Basic Concepts - Problems - Page 42: 1-29C

Answer

It's the ratio of the density of a substance to the density of a reference substance.

Work Step by Step

The specific gravity it's the ratio of the density of a substance to the density of a reference substance, usually water at $4^{\circ}C$ and 1 atm for liquids or air at $25 ^{\circ}C$ and 1 atm for gases. $ SG = \frac{d}{d_{ref}} $
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