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

1.8 - Density

1.8.1 - Density and Temperature

Density is temperature dependent (i.e. - it varies with temperature).

eg - Mercury

 Temperature Density Notation at 20oC 13.55 g/mL = 13.55 g/mL at 270oC 12.95 g/mL = 12.95 g/mL

Compare the densities of some common materials:

 Material Density at room temperature Solid: Aluminum 2.70 g/cm3 Lead 11.4 g/cm3 Liquid: Gasoline 0.67 g/mL Mercury 13.55 g/mL Water 1 g/mL Gas: Air 1.3 g/L Chlorine 3.17 g/L

When mercury, gasoline and water are mixed at room temperature, we would observe three layers because these liquids are immiscible. Look at the densities of these liquids given above, can you predict the order of these layers?

Section 2.8
Dimensional Analysis Method of Problem Solving for Conversions ..p33

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