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.
atmospheres
The standard atmosphere (symbol: atm) is a unit of pressure defined as 101325 Pa (1.01325 bar). It is sometimes used as a reference or standard pressure.