Introduction 1 Properties of Materials 1.1 Physical Properties 1.1.1 Mass Density 1.1.2 Theoretical Density or X-ray Density of Solids 1.1.3 Apparent, Bulk, and Tap Densities 1.1.4 Specific Weight 1.1.5 Specific Gravity 1.1.6 Buoyancy and Archimedes' Principle 1.1.7 Pycnometers for Solids 1.1.8 Density of Mixtures 1.2 Mechanical Properties 1.2.1 Stress and Pressure 1.2.2 Strain 1.2.3 Elastic Moduli and Hooke's Law 1.2.4 The Stress-Strain Curve 1.2.5 Strain Hardening Exponent 1.2.6 Hardness 1.2.7 Resilience and Modulus of Resilience 1.2.8 Toughness ……