Thermal conductivity | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-10-19

This is an audio version of the Wikipedia Article:
Thermal conductivity

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SUMMARY
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Thermal conductivity (often denoted k, λ, or κ) is the property of a material to conduct heat. It is evaluated primarily in terms of Fourier's Law for heat conduction. In general, thermal conductivity is a tensor property, expressing the anisotropy of the property.
Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity. Correspondingly, materials of high thermal conductivity are widely used in heat sink applications and materials of low thermal conductivity are used as thermal insulation. The thermal conductivity of a material may depend on temperature. The reciprocal of thermal conductivity is called thermal resistivity.
The general equation for thermal conductivity is 
  
    
      
        
          
            
              q
              →
            
          
        
        =
        −
        k
        
          
            
              ∇
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        T
      
    
    {\displaystyle {\vec {q}}=-k{\vec {\nabla }}T}
  , where 
  
    
      
        
          
            
              q
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    {\displaystyle {\vec {q}}}
   is the heat flux, 
  
    
      
        k
      
    
    {\displaystyle k}
   is the thermal conductivity and 
  
    
      
        
          
            
              ∇
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        T
      
    
    {\displaystyle {\vec {\nabla }}T}
   is the temperature gradient.