Task: Question Answering
Input (English): Process:  -The thermostat senses that the temperature has dropped -A signal is sent to the heating system -Heating oil travels from the tank to the burner -The oil becomes a fine mist mixed with air -The oil/air combination is injected into the burner -The burner is ignited in the combustion chamber -The furnace heats the air -The blower sends the heated air through the ducts -The heated air comes out the vents and into the room.
 Question: What is the effect of top layer is less impure on burner is ignited in combustion chamber.?
Output (English): none