Enthalpy of vaporization | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-10-18

This is an audio version of the Wikipedia Article:
Enthalpy of vaporization

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SUMMARY
=======
The enthalpy of vaporization, (symbol ∆Hvap) also known as the (latent) heat of vaporization or heat of evaporation, is the amount of energy (enthalpy) that must be added to a liquid substance, to transform a quantity of that substance into a gas. The enthalpy of vaporization is a function of the pressure at which that transformation takes place.
The enthalpy of vaporization is often quoted for the normal boiling temperature of the substance; although tabulated values are usually corrected to 298 K, that correction is often smaller than the uncertainty in the measured value.
The heat of vaporization is temperature-dependent, though a constant heat of vaporization can be assumed for small temperature ranges and for reduced temperature 
  
    
      
        
          T
          
            r
          
        
      
    
    {\displaystyle T_{r}}
  
  
    
      
        ≪
        1
      
    
    {\displaystyle \ll 1}
  . The heat of vaporization diminishes with increasing temperature and it vanishes completely at a certain point called the critical temperature (
  
    
      
        
          T
          
            r
          
        
        =
        1
      
    
    {\displaystyle T_{r}=1}
  ). Above the critical temperature, the liquid and vapor phases are indistinguishable, and the substance is called a supercritical fluid.