3.1.1 Understanding Pressure
3.1.2 Density of Irregular Objects
3.2 Understanding Pressure In Liquids
3.2.1 Understanding Pressure in Liquids
3.2.2 Application of Pressure in Liquids
3.3 Understanding Gas Pressure and Atmospheric Pressure
3.3.1 Understanding Gas Pressure and Atmospheric Pressure
3.3.2 Application of Gas Pressure and Atmospheric Pressure
3.3.3 Existence of Atmospheric Pressure
