def airEntryPotential(theta_s):
    """
    Parameters
    ----------
    theta_s : float
        Soil water content at saturation (m3/m3)
    Returns
    -------
    TYPE
        The air entry potential (cm)
        Is also called bubbling pressure of the soil
        Source: Saxton (1986) DOI: 10.2136/sssaj1986.03615995005000040039x
    """
    return 100.0 * (-0.108 + 0.341 * theta_s)