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  1.      Density or Mass Density – Density or mass density of a fluid is defined as the ratio of the mass of a fluid is defined as the ratio of the mass of a fluid to its volume. Thus per unit of mass per unit of volume of a fluid is called density. It is denoted by the symbol   ρ (rho). The unit off mass density in SI Unit is kg per cubic meter kg/m³.   ρ= mass of fluid/volume of fluid                          Note - The value of density of water is 1gm/cm³ or 1000kg/m³     2.      Specific Weight or Weight Density – Specific weight or weight density of a fluid is the ratio between the weight of a fluid to its volume. Thus weight per unit volume of a fluid is called weight density   and it is denoted by the symbol small w .        ...