def func_calc_st(T,Qref,Tref,Tc):
    """
    Calculate Elevated Temperature Surface Tension
    Parameters:
        Qref  :  Reference Surface Tension at temperature T, (mN/m)
        Tref  :  Reference temperature (K)
        Tc    :  Critical temperature (K)
    Return:
        Surface Tension at temperature T
    """
    tmp = (Tc-T)/(Tc-Tref)
    return pow(tmp,11/9)*Qref