| Most modern stoves are airtight and allow the amount of combustion air that feeds the flame to be controlled. |
| Efficiency is the result of many factors, including airflow, combustion, and parasitic losses such as friction and windage. |
| The combustion chamber environment is very air-rich and the rotors have a lot of overlap to promote exhaust gas recirculation. |
| The sparks generated by striking steel against a flint provide the activation energy to initiate combustion in this Bunsen burner. |
| The cost of charging an electric car is small compared to that of refuelling a vehicle that runs an internal combustion engine. |
| On the downward stroke of the piston, the intake valve opens to release fuel into the combustion chamber, then closes. |
