The thermal conductivity of solids can vary significantly with: alloying processing, density or compaction, and water content. For example, the conductivity of pure iron is 80W/m-K, of 1.0% carbon steel is 43 W/m-K, and of 304 stainless steel is 14 W/m-K, each at 293 K.
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2002 CODATA with (1 sigma) uncertainty | |
---|---|
Avogadro's number | 6.0221415(10) x 10^{26} molecules/kmol |
Boltzmann's constant | 1.3806505(24) x 10^{-23} J/K |
Ideal gas constant | 8314.472(15) J/kmol-K |
Speed of light | 2.99792458(0) x 10^{8} m/s |
Gravitational acceleration | 9.80665(0) m/s^{2} |
Stefan-Boltzmann constant | 5.670400(40) x 10^{-8} W/m^{2}-K^{4} |
NIST physical constants web site
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Quantity | S.I. Units | = | Multiplier | x | Other Units |
---|---|---|---|---|---|
density | kg/m^{3} | = | 16.018 | x | lbm/ft^{3} |
kg/m^{3} | = | 10^{3} | x | g/cm^{3} | |
diffusivity | m^{2}/s | = | 0.092903 | x | ft^{2}/s |
m^{2}/s | = | 10^{-6} | x | centistokes | |
energy | J | = | 1055.04 | x | Btu |
J | = | 4.1868 | x | calorie | |
flow rate | m^{3}/s | = | 6.3090 x 10^{-5} | x | gal/min (gpm) |
m^{3}/s | = | 4.7195 x 10^{-4} | x | ft^{3}/min (cfm) | |
heat flux | W/m^{2} | = | 3.154 | x | Btu/hr-ft^{2} |
heat transfer coefficient | W/m^{2}-K | = | 5.67826 | x | Btu/hr-ft^{2}-F |
length | m | = | 0.0254 | x | inches |
m | = | 0.3048 | x | feet | |
power | W | = | 0.022597 | x | ft-lb/min |
W | = | 0.29307 | x | Btu/hr | |
W | = | 745.700 | x | horsepower | |
pressure | Pa | = | 248.8 | x | in. H_{2}O |
Pa | = | 6894.8 | x | psi | |
Pa | = | 101325. | x | atm | |
specific heat | J/kg-K | = | 4186.9 | x | Btu/lbm-F |
J/kg-K | = | 4186.8 | x | cal/g-C | |
thermal conductivity | W/m-K | = | 1.7307 | x | Btu/hr-ft-F |
W/m-K | = | 418.68 | x | cal/s-cm-C | |
dynamic viscosity | Pa-s | = | 10^{-3} | x | centipoise |
Pa-s | = | 1.4881 | x | lbm/ft-s | |
Pa-s | = | 47.8803 | x | lbf-s/ft^{2} | |
temperature | K | = | 5/9 | x | R |
K | = | 273.15 + C | |||
K | = | (459.67 + F)/1.8 | |||
Quantity | S.I. Unit | = | Multiplier | x | Other Unit |
NIST booklet on SI units and conversion factors (pdf version of publication SP811)
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