def dew_point_from_db_hr(db_temp, hr, b_press=<NUM_LIT>):
rh = rel_humid_from_db_hr(db_temp, hr, b_press)<EOL>td = dew_point_from_db_rh(db_temp, rh)<EOL>return td<EOL>
Dew Point Temperature (C) at Temperature db_temp (C),
    Humidity Ratio hr (kg water/kg air) and Pressure b_press (Pa).