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1. Bernoulli's principle
vfluid flow speed at a point on a streamline (m/s)
gacceleration due to gravity (m/s2)
zelevation of the point above a reference plane, with the positive z-direction pointing upward – so in the direction opposite to the gravitational acceleration (m)
ppressure at the chosen point (N/m2)
ρdensity of the fluid at all points in the fluid (kg/m3)
constantconstant (m2/s2)
Variables...
  valueunitslink
v
g
z
p
ρ
constant
2. Bernoulli’s Equation (conservation of energy)
P1Absolute pressure at point 1 (N/m2)
ρFluid density (kg/m3)
v1Velocity of the fluid at point 1 (fluid flow speed) (m/s)
gStandard gravity
h1Height of point 1 above some reference point (m)
P2Absolute pressure at point 2 (N/m2)
v2Velocity of the fluid at point 2 (fluid flow speed) (m/s)
h2Height of point 2 above some reference point (m)
Variables...
  valueunitslink
P1
ρ
v1
h1
P2
v2
h2
3. Borda–Carnot equation ( in relation to Bernoulli's principle)
ΔE The fluid's mechanical energy loss per unit of fluid volume (J/m3)
p2The pressure at location 2 (Pa)
p1The pressure at location 1 (Pa)
ρThe fluid density (kg/m3)
v2The mean flow velocity after expansion (m/s)
v1 The mean flow velocity before expansion (m/s)
Variables...
  valueunitslink
ΔE
p2
p1
ρ
v2
v1

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