UNIT # 1 Introduction Objectives Reading 1.1 Metric System 1.2 1.3 Scientific Notation 1.4 Dimensional Analysis 1.5 1.6 1.7 1.8 Problems 1 | 2 | 3

MEASUREMENT

1.9 - Specific Gravity

Specific gravity of a substance a comparison of the density of a substance relative to a standard value. Scientists express specific gravity of liquids and solids using water at 4oC as the standard.

In calculating the specific gravity of a substance, the density of the substance and the density of water are expressed in the same units. This leaves specific gravity unitless.

The density of water at 4oC is 1.00 g/mL. Therefore, the density of solids or liquids expressed as g/mL is numerically equal to their specific gravities.

The notation of expressing specific gravity is given below. Place your mouse over the image to get a brief explanation of the notation.

Section 2.9
Specific Gravity ..p39

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