Unit Conversion Factors
Note: En = 10n, e.g., E5=105, E-5=10-5.
Specific Energy (Heat / Volume)
→ |
J/m3 |
kJ/m3 |
kcal/m3 |
Btu/ft3 |
Chu/ft3 |
MJ/m3* |
J/m3 |
1 |
1E-3 |
1.338E-4 |
2.684E-5 |
1.491E-5 |
1E-6 |
kJ/m3 |
1 000 |
1 |
0.238 8 |
0.026 84 |
0.014 91 |
1 E-3 |
kcal/m3 |
4.187E3 |
4.187 |
1 |
0.112 4 |
0.062 43 |
4.187E-3 |
Btu/ft3 |
3.726E4 |
37.26 |
8.899 |
1 |
0.555 6 |
0.037 26 |
Chu/ft3 |
6.707E4 |
67.07 |
16.02 |
1.800 |
1 |
0.067 07 |
MJ/m3 |
1E6 |
1000 |
238.8 |
26.84 |
14.91 |
1 |
1 therm (105 Btu) / UK gal = 23 208 MJ/m3
1 thermie/liter = 4.185 MJ/m3
*MJ/m3 = J/cm3
Heat Transfer, Temperature
Energy/unit mass |
1 Btu/lbm = 2.326 kJ/kg |
1 kJ/kg = 0.4299 Btu/lbm |
Heat/unit area |
1 Btu/hr∙ft2 = 3.154 W/m2 |
1 W/m2 = 0.317 Btu/hrּft2 |
Heat/unit length |
1 Btu/hr∙ft = 0.9613 W/m |
1 W/m = 1.0403 Btu/hrּft |
Thermal Conductivity (κ) |
1 Btu/hr∙ft∙°F = 1.7307 W/m.°C |
1 W/m∙°C = 0.5778 Btu/hrּftּ°F |
Convection Heat Transfer Coefficient (h) |
1 Btu/hr∙ft2ּ°F = 5.6783 W/m2ּ°C |
1 W/m2∙°C = 0.1761 Btu/hrּft2ּ°F |
Specific Heat (Cp) |
1 Btu/lbmּ°F = 4.1869 kJ/kgּ°C |
1 kJ/k∙°C = 0.23884 Btu/lbmּ°F |
Dynamic Viscosity (μ) |
1 kg/mּs = 0.672 lbm/ftּs = 2419.2 lbm/ftּhr |
1 lbm/ft∙s = 1.4881 kg/mּs |
Kinematic Viscosity (ν) and Thermal Diffusivity (α) |
1 ft2/s = 0.092903 m2/s |
1 m2/s = 10.7639 ft2/s |
Temperature (ΔT) |
°R = 1.8 °K OR °F = 1.8 °C |
°K = 0.556 °R OR °C = 0.556 °F |
Temperature (T) |
T (°F) = 1.8 * T (°C) + 32 |
°K = 0.556 °R OR °C = 0.556 °F |
Temperature (T) |
T (°R) = T (°F) + 459.67 |
T (°K) = T (°C) + 273.15 |
Stefan-Boltzmann constant (σ) |
0.1714E8 Btu/hrּft2ּ°R4 |
5.669 E8 W/m2ּ°K4 |
Thermal Expansion |
1 μin/in ּ°F = 1.8E-6/K |
1/K = 5.556E5 μin/in ּ°F |
Thermal Resistance Coefficient |
1 clo = 0.15482 m2ּ°K/W |
1 m2ּ°K/W = 6.459 clo |
Electric capacitance |
1 jar = 1.111E-9 F (Farad) |
1 F = 9.000E8 jar |
a.u. of charge |
1 a.u., e = 1.60218E-19 C (coulomb) |
1 C = 6.241E18 a.u., e |
electrostatic unit |
1 esu = 3.336E-6 C |
1 C = 0.300E5 esu |
franklin |
1 Fr = 3.33564E-10 C |
|
a.u. of charge density |
1 a.u. = 1.0812E12 C/m3 |
|
coulomb per cubic inch |
1 C/in3 = 6.10237E4 C/m3 |
|
coulomb per square inch |
C/in2 = 1550 C/m2 |
|
Electric conductance |
1 mho = 1 S (siemens) |
1 S = 1 mho |
Electric conductivity |
1 roc = 100 S/m = 100 rom |
|
Electric current |
1 a.u. = 6.624E-3 A = 6.624E-3 C/s |
|
Electric dipole moment |
1 a. u. = 8.478E-30 C-m |
|
electric field strength |
1 a. u. = 5.142E11 V/m = 5.142E11 N/C |
|
Electric inductance |
1 J/A2 = N-m/A2 = 1 H = V·s/A |
|
Electric permittivity |
1 A·s/V·m = 1 C2/N·m2 = 1 F/m |
|
Electric potential |
1 a. u. = 27.21 V = 27.21 J/C, 1 statV = 299.792 V |
|
Electric resistance |
1 siemens (resistance) = 0.96 Ω, 1 statohm = 8.988E11 Ω |
|
Molar electric charge |
1 F (Faraday) = 9.65E4 C/mol |
1 C/mol = 1.036E-5 |
Electromagnetic radiation flux density |
1 jansky = 1E-26 W/m2-Hz |
Magnetic auxiliary field |
1 oe (oersted) = 79.5775 A/m, 1 praoersted = 1.14591E4 A/m |
Magnetic dipole moment |
1 a.u. = 1.855E-23 A?m2 = 1.855E-23 J/T |
Magnetic field strength |
1 a.u. = 2.351E5 T = 2.351E5 N/A?m = 2.351E14 g = 2.351E9 Gs |
Magnetic flux |
1 line = 1 Mx = 1E-8 Wb = 7.958E-2 unit pole |
Magnetic permeability |
1 V?s/A?m = 1 N/A2 = 1 H/m |
Magnetomotive force |
Gb = 0.79577 A, 1 pragilbert = 1.146E4 A |
Recommended SI Units For Properties of Steel
PHYSICAL PROPERTIES |
|
Density |
kg/m3 |
ELECTRICAL PROPERTIES |
|
Resistivity |
Ωm |
MECHANICAL PROPERTIES |
|
Tensile strength |
N/mm2 (MN/m2) |