def rhow_K75(tempK):
    """Water density in g/cm**3 following Kell (1975) J. Chem. Eng. Data 20(1),
    97-105.
    """
    tempC = tempK - 273.15
    return (0.99983952 + 0.016945176 * tempC - 7.9870401e-06 * tempC ** 2 -
        4.6170461e-08 * tempC ** 3 + 1.0556302e-10 * tempC ** 4 - 
        2.8054253e-13 * tempC ** 5) / (1 + 0.01687985 * tempC)
