“70 bar misting” is not a humidifier. It is a water-pressure system: water is pressurised to about 70 kg/cm² and forced through very small nozzles.
Pressure decides droplet size
At 70 bar with matched nozzles, droplets fall in the 5–15 μm range. At that scale they settle slowly and evaporate, instead of wetting the ground.
Flow decides coverage
Flow is how much water is delivered. More flow means more nozzles, and higher demands on water supply and control. Pressure alone tells you very little.
A common mistake
Assuming higher pressure is always better. It accelerates nozzle wear and scale, and demands stronger piping. Choose nozzles for the scene first, then the pressure follows.