They watched the sample combusting under the microscope.

If exposed to a spark, the solvent combusts within seconds, endangering everyone nearby.

The experimental rocket combusted minutes after liftoff, forcing engineers to abort the mission.

The combustive mixture ignited unexpectedly during the experiment.

Before the experiment, the team measured the combustibleness of each sample to ensure safety.

He stored the solvents combustibly, which made the warehouse a serious fire hazard.

The research team installed several combusters to improve fuel efficiency in the prototype engines.

The engineer compared the combustibilities of several new materials to determine which would be safest in high-temperature environments.

The researchers analyzed pre-combustion emissions to identify which compounds formed prior to ignition.

Scientists investigated several reports of spontaneous combustions in the old warehouse district.