```
Pump Head Unit (mLC) = (Discharge Pressure (atm) * Density of Liquid (kg/m³)) / (Gravitational Acceleration (m/s²) * 10)
```
Here is an example calculation:
If a pump has a discharge pressure of 5 atm and is pumping water with a density of 1000 kg/m³, the pump head unit can be calculated as:
```
Pump Head Unit (mLC) = (5 atm * 1000 kg/m³)/(9.81 m/s² * 10) = 510.2 mLC
```
Therefore, the pump head unit for this pump would be 510.2 mLC.