def Latentc(tempc):
    """Latent heat of condensation (vapourisation)

    INPUTS:
    tempc (C)

    OUTPUTS:
    L_w (J/kg)

    SOURCE:
    http://en.wikipedia.org/wiki/Latent_heat#Latent_heat_for_condensation_of_water
    """
   
    return 1000 * (2500.8 - 2.36 * tempc + 0.0016 * tempc ** 2 - 0.00006 * tempc ** 3)