def _mul_units(units, power):
    """Helper method to handle units when quantities are raised to a power
    
    Parameters
    ----------
        units : dict
            Units
        power : float
            Power to raise
    Returns
    -------
        units_out : dict
            Multiplied units
    """
    out_dict = {}
    for key in units.keys():
        out_dict[key] = units[key]*power
    return out_dict