• Density (ρ):
    The mass per unit volume of a material, usually measured in pounds per cubic foot (lb/ft³) or kilograms per cubic meter (kg/m³).
  • Specific Weight (γ):
    Defined as the weight per unit volume of a material, measured in pounds per cubic foot (lb/ft³) or Newton’s per cubic meter (N/m³).
  • Specific Gravity:
    The ratio of the specific weight of a material to that of water at a given temperature.
  • Static Pressure:
    The pressure of stationary fluids or gases.

Definitions

Dynamic Pressure:
The pressure exerted by a fluid or gas when it impacts a surface due to its motion or flow. It can be calculated as the difference between points B and A.

Impact Pressure (Total Pressure):
The sum of static and dynamic pressures on a surface, shown at point.