ضرایب تبدیل
1 in = 25.4 mm
1 ft = 0.304 8 m
1 yd = 0.914 4 m
1 mile = 1.609 3 km
1 Å (angstrom)= 10-10m
1 min = 60 s
1 h = 3.6 ks
1 day = 86.4 ks
1 year = 31.5 Ms
1 in2 = 645.16 mm2
1 ft2 = 0.092 903 m2
1 yd2 = 0.836 13 m2
1 acre = 4046.9 m2
1 mile2 = 2.590 km2
1 in3 = 16.387 cm3
1 ft3 = 0.028 32 m3
1 yd3 = 0.764 53 m3
1 UK gal = 4546.1 cm3
1 US gal = 3785.4 cm3
1 oz = 28.352 g
1 lb = 0.453 592 37 kg
1 cwt = 50.802 3 kg
1 ton = 1016.06 kg
1 metric ton = 1000 kg
1 pdl = 0.138 26 N
1 lbf = 4.448 2 N
1 kgf = 9.806 7 N
1 tonf = 9.964 0 kN
1 dyn = 10-5N
1 deg F (degR) 5/9 deg C (deg K)
Power (heat flow)
1 hp (British) = 745.70 W
1 hp (metric) = 735.50 W
1 erg/s = 10-7 W
1 ft lbf/s = 1.355 8 W
1 Btu/h = 0.293 07 W
1 ton of refrigeration 3516.9 W
Energy (work, heat)
1 ft lbf = 1.355 8 J
1 ft pdl = 0.042 14 J
1 cal
(int table) = 4.186 8 J
1 erg = 10-7 J
1 Btu = 1.055 06 kJ
1 hp h = 2.684 5 MJ
1 kWh = 3.6 MJ
1 therm = 105.51 MJ
1 thermie = 4.185 5 MJ
Calorific value (volumetric)
1 Btu/ft3 = 37.259 kJ/m3
1 ft/s = 0.304 8 m/s
1 mile/h = 0.447 04 m/s
1 ft3/s = 0.028 316 m3/s
1 ft3/h = 7.865 8 cm3/s
1 UK gal/h = 1.262 8 cm3/s
1 US gal/h = 1.051 5 cm3/s
1 lb/h = 0.126 00 g/s
1 ton/h = 0.282 24 kg/s
1 lb/in2 = 703.07 kg/m2
1 lb/ft2 = 4.882 4 kg/m2
1 ton/sq mile = 392.30 kg/km2
1 lb/in3 = 27.680 g/cm3
1 lb/ft3 = 16.019 kg/m3
1 lb/UK gal = 99.776 kg/m3
1 lb/US gal = 119.83 kg/m3
1 lbf/in2 (psi) = 6.894 8 kN/m2
1 tonf/in2 = 15.444 MN/m2
1 lbf/ft2 = 47.880 N/m2
1 standard atm 101.325 kN/m2 (kPa)
1 bar = 105 N/m2
1 ft water = 2.989 1 kN/m2
1 in water = 249.09 N/m2
1 in Hg = 3.386 4 kN/m2
1 mm Hg (1 torr) 133.32 N/m2
1 lb ft2 = 0.042 140 kg m2
1 lb ft/s = 0.138 26 kg m/s
1 lb ft2/s = 0.042 140 kg m2/s
1 P (poise) = 0.1 N s/m2
1 lb/ft h = 0.413 38 mN s/m2
1 lb/ft s = 1.488 2 N s/m2
1 S (stokes) = 10-4 m2/s
1 ft2/h = 0.258 06 cm2/s
Surface energy (surface tension)
1 dyn/cm2 (1 erg/cm) = 10-3 J/m2
1 lb/h ft2 = 1.356 2 g/s m2
1 Btu/h ft3 = 3.154 6 W/m2
1 kcal/h m2 = 1.163 W/m2
1 Btu/h ft2 °F = 5.678 3 W/m2 K
Specific enthalpy (latent heat, etc)
1 Btu/lb = 2.326 kJ/kg
Heat capacity (specific heat)
1 Btu/lb °F = 4.186 8 kJ/kg K
1 Btu/h ft °F = 1.730 7 W/m K
1 kcal/h m °C = 1.163 W/m°K
Avogadro’s number N = 6.023 x 1026 kmol-1
Boltzmann’s constant k = 1.3805 x 10-23 J/K
Planck’s constant h = 6.626 x 10-34 J s
Gravitational acceleration g = 9.807 m/s2
Universal gas constant R = 8.314 kJ/kmol K = 0.082 l atm/mol K
Stefan-Boltzmann constant [ = 5.6697 x 10-8 W/m2 K4
Universal constant of gravitation G = 6.67 x 10-11 N m2/kg2
Electronic charge e = 1.602 x 10-19C
Electron volt eV = 1.602 x 10-19 J
Velocity of light in vacuum c = 2.99795 x 108 m/s
Volume of 1 kmol of ideal gas at stp = 22.41 m3
S.t.p. = 1.013 x 105 N/m2 and 273.15 K
Density of water ~ 103 kg/m3
Viscosity of water (18°C) ~ 10-3 N s/m2
Heat capacity of water ~ 4 kJ/kg K
Thermal conductivity of water ~ 0.6 W/m K
Latent heat of boiling water ~ 2 MJ/kg
Density of air at s.t.p. ~ 1 kg/m3
Viscosity of air at s.t.p. ~ 1.7 x 10-5 N s/m2
Heat capacity of air at s.t.p. ~ 1 kJ/kg K
Thermal conductivity of air at s.t.p. ~ 0.024 W/m K
0 ºC = 273 K 0 ºF = 460 ºR 0 ºC = 273 K 0 ºF = 460 ºR
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