A centimetre of water (US spelling centimeter of water, abbreviated cm H2O or cm H2O) is a less commonly used unit of pressure derived from pressure head calculations using metrology.
millipascals
The millipascal is a multiple of the unit bit for Pressure. The prefix milli (symbol m) is defined in the International System of Units (SI) as a multiplier of 1 × 10-3 (1 thousandth, short scale), and therefore 1 millipascal = 1 × 10-3 pascals = 0.001 pascals. The millipascal has the unit symbol mPa.