Answer:
[tex]\boxed{\text{exhaust stroke}}[/tex]
Explanation:
The four strokes are
- Intake: The mixture of air and fuel enters the cylinder.
- Compression: The mixture is compressed by a factor of about 11.
- Ignition: A spark ignites the fuel, which burns and produces CO₂, CO, and H₂O.
- Exhaust: The combustion products are expelled from the cylinder.
[tex]\text{The cylinder releases CO$_{2}$, CO, and H$_{2}$O during the }\boxed{\textbf{exhaust stroke}}[/tex]
