Symbols used in fluid mechanics

a = Acceleration (m/s2 A = Area (m2) ) a = Speed of sound (m/s) F = Force (N) g = acceleration due to gravity (m/s2 ) h = fluid head (m) K = Bulk modulus (MPa ) m = mass (kg) M = mach number u /a M = Molecular weight p = fluid pressure (N /m2 ) pabs - absolute pressure (N /m2 ) pgauge - gauge pressure (N /m2 ) patm - atmospheric pressure (N /m2 ) p s= surface pressure (N /m2 ) Q = Volume flow rate (m3 /s) q = Heat transfer /unit mass (J/kg)

R = Gas Constant (J/(kg.K) Ro = Universal Gas Constant (J/(kg.mol.K) ρ = fluid density (kg /m2 ) s = specific volume (m3 /kg) u = fluid velocity (m/s) v = fluid velocity (m/s) x = depth of centroid (m) β = Compressibility (1/MPa) θ =slope (radians) ρ = density (kg/m3) ρ r = density (kg/m3) τ = shear stress (N /m2) μ = viscosity (Pa.s) ν kinematic viscosity (m2�s-1) υ = Specific volume (m3 / kg) γ= Ratio of Specific Heats