mPa – Millipascal Pressure Unit Find conversions for the mPa (millipascal) pressure unit. 250 mPa to bar How many bar is 250 millipascal equal to? 250 millipascal is a very small value when converted to bar pressure units: 250 mPa = 0.25 Pa = 0.0000025 bar. Featured pa - pascal based unit range pressure measurement products 1000 bar, 15000 psi, 100 MPa Pressure Gauges, Meters & Manometers