`
`Tables
`
`Reference
`Young
`Ch 15.
`
`2/12/24, 9:05 PM
`
`Thermal Conductivity
`
`Thermal Conductivity
`
`Material
`
`Diamond
`Silver
`Copper
`Gold
`Brass
`Aluminum
`Iron
`Steel
`Lead
`Mercury
`Ice
`Glass,ordinary
`Concrete
`Water at 20° C
`Asbestos
`Snow (dry)
`Fiberglass
`Brick,insulating
`Brick, red
`Cork board
`Wool felt
`Rock wool
`Polystyrene (styrofoam)
`Polyurethane
`Wood
`Air at 0° C
`Helium (20°C)
`Hydrogen(20°C)
`Nitrogen(20°C)
`Oxygen(20°C)
`Silica aerogel
`
`Thermal conductivity
`(cal/sec)/(cm2 C/cm)
`...
`1.01
`0.99
`...
`...
`0.50
`0.163
`...
`0.083
`...
`0.005
`0.0025
`0.002
`0.0014
`0.0004
`0.00026
`0.00015
`...
`...
`0.00011
`0.0001
`...
`...
`...
`0.0001
`0.000057
`...
`...
`...
`...
`...
`
`Thermal conductivity
`(W/m K)*
`1000
`406.0
`385.0
`314
`109.0
`205.0
`79.5
`50.2
`34.7
`8.3
`1.6
`0.8
`0.8
`0.6
`0.08
`...
`0.04
`0.15
`0.6
`0.04
`0.04
`0.04
`0.033
`0.02
`0.12-0.04
`0.024
`0.138
`0.172
`0.0234
`0.0238
`0.003
`
`hyperphysics.phy-astr.gsu.edu/hbase/Tables/thrcn.html
`
`1/3
`
`1
`
`APPLE 1030
`
`
`
`Thermal Conductivity
`2/12/24, 9:05 PM
`*Most from Young, Hugh D., University Physics, 7th Ed. Table 15-5. Values
`for diamond and silica aerogel from CRC Handbook of Chemistry and
`Physics.
`
`Note that 1 (cal/sec)/(cm2 C/cm) = 419 W/m K. With this in mind, the two
`columns above are not always consistent. All values are from published
`tables, but can't be taken as authoritative.
`
`The value of 0.02 W/mK for polyurethane can be taken as a nominal figure
`which establishes polyurethane foam as one of the best insulators. NIST
`published a numerical approximation routine for calculating the thermal
`conductivity of polyurethane at
`http://cryogenics.nist.gov/NewFiles/Polyurethane.html . Their calculation for
`freon filled polyurethane of density 1.99 lb/ft3 at 20°C gives a thermal
`conductivity of 0.022 W/mK. The calculation for CO2 filled polyurethane of
`density 2.00 lb/ft3 gives 0.035 W/mK .
`
`Heat conduction discussion
`Debye Temperature and Thermal Conductivity
` HyperPhysics***** Thermodynamics
`
`Wiedemann-Franz Ratio
`
`The ratio between thermal and electrical conductivities of metals can be
`expressed in terms of the ratio:
`
`which may be called the Wiedemann-Franz Ratio or the Lorenz constant.
`
`Metal k/sT (10-8WW/K2)
`Cu
`2.23
`Ag
`2.31
`Au
`2.35
`Zn
`2.31
`Cd
`2.42
`Sn
`2.52
`
`Go Back
`
`Index
`
`Tables
`
`Reference
`Blatt
`Section
`13.2
`
`hyperphysics.phy-astr.gsu.edu/hbase/Tables/thrcn.html
`
`2/3
`
`2
`
`
`
`2/12/24, 9:05 PM
`
`Thermal Conductivity
`
`2.61
`Mo
`2.47
`Pb
`2.51
`Pt
`Heat conduction discussion
`Wiedemann-Franz Law
` HyperPhysics***** Thermodynamics
`
`Go Back
`
`hyperphysics.phy-astr.gsu.edu/hbase/Tables/thrcn.html
`
`3/3
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`3
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`
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