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Properties of Water and Air |
Property |
Symbol |
Definition |
Water (20 °C) |
Air (STP) |
Density |
ρ |
mass/volume |
1000 kg/m3 |
1.23 kg/m>3 |
Viscosity |
μ |
shear stress velocity gradient |
10-3 N-s/m2 |
2.0×10-5 N-s/m2 |
Kinematic Viscosity |
ν |
viscosity/density |
10-6 m2/s |
1.6×10-5 m2/s |
Speed of Sound |
c |
velocity of a small wave |
1480 m/s |
343 m/s |
Specific Weight |
γ |
weight/volume |
9800 N/m3 |
12 N/m3 |
Surface Tension |
σ |
stored energy unit area |
0.073 J/m2 |
|
Bulk Modulus |
K |
volume (ΔP/ΔV) |
220×104 kPa |
|
Vapor Pressure |
pv |
pressure of liquid-vapor equilibrium |
2.45 kPa |
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