The document defines several key properties of fluids: density is defined as mass per unit volume and its SI unit is kg/m3; specific volume is the reciprocal of density and defined as volume per unit mass; specific gravity is the ratio of a fluid's density to a standard fluid like water, and is unitless; and specific weight is defined as weight per unit volume and has an SI unit of N/m3. The document also provides examples that water has a density of 1000 kg/m3 and mercury has a density of 13600 kg/m3.

1. BY
Er. R.P. Ojha
R.P. Sir 1

2. Property of
fluid
density Specific
volume
Specific
weight
Viscosity
compressib
ilitty
Surface
tension
CApillarity

3. density
• It is defined as mass per unit volume
• Denoted by ρ
• ρ = m/V
• SI Unit – kg/m3
• CGS UNIT – gm/cm3
• Density of water is 1000 kg/m3 and of mercury
is 13600 kg/m3

4. Specific volume
• Define as volume per unit mass
• Reciprocal of density
• v = V/m
• SI Unit – m3/kg

5. Specific gravity
• Ratio of density of fluid to the density of
standard fluid
• Generally standard fluid is considered as air
for gases and water for liquids
• It is unitless
• Specific gravity = ρfluid / ρstd fluid
• Water has specific gravity 1 and mercury has
13.6

6. Specific weight
• Defined as weight per unit volume
• w = W/V
• SI unit – N/m3