def rel_humid_from_db_wb(db_temp, wet_bulb, b_press=101325):
    """Relative Humidity (%) at db_temp(C), wet_bulb (C), and Pressure b_press (Pa).
    """
    # Calculate saturation pressure.
    p_ws = saturated_vapor_pressure(db_temp + 273.15)
    p_ws_wb = saturated_vapor_pressure(wet_bulb + 273.15)
    # calculate partial vapor pressure
    p_w = p_ws_wb - (b_press * 0.000662 * (db_temp - wet_bulb))
    # Calculate the relative humidity.
    rel_humid = (p_w / p_ws) * 100
    return rel_humid
Relative Humidity (%) at db_temp(C), wet_bulb (C), and Pressure b_press (Pa).