That little spark is what ignites the mixture and pushes the piston back up. The other type of combustion engine is a compression-ignition engine. This type of engine is what's used in vehicles ...

Combustion is another name for burning ... But, it's often really unsafe to leave a fire for that long and so different types of fires need to be tackled in slightly different ways.

NASA scientists are especially excited about the potential applications for a bizarre, unprecedented type of combustion they observed in space this past spring: When certain types of liquid fuel ...