PROPERTIES OF FLUIDS

INTRODUCTION

                        Fluid mechanics is that branch of science which deals with the behavior of the fluids (liquids or gases) at rest as well as in motion. 

PROPERTIES OF FLUIDS

    DENSITY OR MASS DENSITY : 

                 It is defined as the ratio of the mass of a fluid to its volume. 

                OR

   Mass per unit volume is called density. 

                 It is denoted by symbol 'rho'. 

   The value of density of water is 1000kg/m³ or       1gm/cm³.

SPECIFIC WEIGHT OR WEIGHT DENSITY

                It is the ratio between the weight of a fluid to its volume. 

  The value of specific weight or weight density for water is 9.81 × 1000 Newton/m³.

SPECIFIC VOLUME

            It is defined as the volume of a fluid occupied by a unit mass or volume per unit mass is called specific volume. 

    Thus specific volume is the reciprocal of mass density. It's is expressed as m³/kg. It is commonly applied to gases. 

  

SPECIFIC GRAVITY

           It is defined as the ratio of the weight density (or density)of a fluid to the weight density (or density) of a standard fluid. For liquids, the standard fluid is taken water at 4°C and for gases, the standard fluid is taken air. 

 Specific gravity is also called relative density. 

 If the specific gravity of a fluid is known, then the density of the fluid will be equal to specific gravity of fluid multiplied by the density of water. 

For example, the specific gravity of mercury is 13.6, hence density of mercury = 13.6×1000 = 13600 kg/m³.

                                   The End

    Please comment if you have any query. 

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