def clear(self):
self._compound_mfrs = self._compound_mfrs * <NUM_LIT:0.0><EOL>self._P = <NUM_LIT:1.0><EOL>self._T = <NUM_LIT><EOL>self._H = <NUM_LIT:0.0><EOL>
Set all the compound mass flow rates in the stream to zero.
Set the pressure to 1, the temperature to 25 and the enthalpy to zero.