| V | Fluid velocity (m/s) |
| P | Fluid pressure (N/m2) |
| g | Gravitational acceleration (m/s2) |
| γ | Specific weight (N/m3) |
| Z | Potential energy per unit weight (J/kg) |
| Q | Volumetric flow rate (m3/s) |
| r | Radius (m) |
| ΔH | The head imparted to liquid by the pump (m) |
| H | Height (m) |
| V0 | Voltage at A0 pin of Arduino (Volt) |
| R1 | 10 kΩ resistance |
| R2 | Resistance value of LDR (kΩ) |
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