Use these equations to convert between U.S. and S.I. units. 1 dm3/s = 3.6 m3/h = 15.9 U.S. gal. /min. = 13.2 U.K. gal. /min. 1 bar = 100 kPa = 0.1 MPa = 1.02 kg/cm2 = 0.987 atm = 14.5 psig