Fluid Properties

Fluid Properties

1. Density

   • p=m/V
   • Density=Mass/Volume
   • units: kg/m3 , g/cm3, lbm/ft3, slug/ft3

2. Specific Gravity

   • SG=p(liquid)/p(water)
   • No units, is diminsionlesss
   • Gases, no standard basis for reference density.
   • p(liquid)=density of liquid
   • ρwater = density of water at a reference temperature (4⁰C or 60⁰F)

3. Specific Weight

   • Units: (N/m3, lbf/ft3)
   • y=W/V
   • W=Weight
   • V=Volume

4. Because W = mg we have the relationship:

   • y = weight/volume = mass*g/volume = (mass/volume)*g
     • y = pg
     • specific gravity(material) = p(material)/p(water @4C) = y(materials)/y(water @4C)