SISTEMA INTERNACIONAL DE UNIDADES (SI) PREFIJOS 1012 109 106 103 tera giga mega kilo 10-2 10-3 10-6 10-9 T G M k centi mili micro nano c m µ n UNIDADES FUNDAMENTALES tiempo: longitud: masa: temperatura: Cantiad de substancia: segundo metro kilogramo Kelvin s m kg K mol mol UNIDADES DERIVADAS fuerza: presión: energía: potencia: Newton Pascal Joule Watt N = kg m /s2 Pa = N / m2 = kg / (m s2 ) J =Nm = kg m2 /s2 W=J/s = kg m2 /s3 FACTORES UNITARIOS DE CONVERSIÓN DE UNIDADES Longitud Fuerza 1 m = 3.28084 ft = 39.3701 in → 1 lb = 32.174 lb ft / s2 = 4.4482 N 1 in = 2.54 cm 1 ft = 30.48 cm = 12 in → 1 kg = 9.807 kg m /s2 = 9.807 N Factor gravitacional (unitario) gc = 1 kg m /(N s2) → = 32.174 lb ft / (lb s2) → = 9.807 kg m / (kg s2) Masa Volumen 1 kg = 2.20462 lb 1 lb = 0.453593 kg 1 m3 = 1000 L = 35.3147 ft3 = 264.17 gal Presión 1 bar = 100 kPa = 0.1 MPa = 0.986923 atm = 14.5038 psia → = 1.0197 kg / cm2 = 750.062 mmHg = 401.48 in H2O 1 atm = 1.01325 bar = 101.325 kPa = 0.101325 MPa = 14.696 psia → = 1.0332 kg / cm2 = 760 mmHg = 406.8 in H2O Energía Potencia 1 kJ = 103 Pa m3 = 104 bar cm3 = 9869.23 atm-cm3 = 239.01 cal = 0.94845 Btu 1 kW = 1 kJ / s = 3414.4 Btu / h = 1.341 HP = 860.4 kcal / h → = 737.562 lb ft → = 737.562 lb ft / s → =1.0197x104 kg cm Moles 1 lbmol = 453.59 mol 1 kgmol = 1000 mol 1 kgmol = 2.20462 lbmol 1 gmol = 1 mol Constante Universal R = 8.3145 J/(mol K) = 83.145 bar cm3 / (mol K) = 1.987 cal / (mol K) = 1.986 Btu / (lbmol R) = 82.06 atm cm3 / (mol K) = 10.73 psia ft3 / (lbmol R)