mm of water
The millimeter of water (mmH₂O) is a unit of pressure exerted by a 1 millimeter column of water at 4 degrees Celsius under standard gravity.
Kilogram force per square meter
Kilogram force per square meter (kgf/m²) is a unit from the force of one kilogram under standard gravity (9.80665 m/s²) on an area of one square meter.