IPA: /ɪkˈspləʊsɪvnəs/
KK: /ɪkˈsplosɪvnəs/
The quality or state of being able to explode or cause an explosion.
The explosiveness of the fireworks surprised everyone at the show.
Explosiveness is formed from "explosive" (from Latin "explosivus", meaning to drive out or to burst forth) and the suffix "-ness" (meaning the state or quality of). The word describes the quality of being explosive or capable of bursting forth with force.
Think of something that can 'burst forth' ('explosive') and the '-ness' indicating a state or quality. This helps you remember that explosiveness refers to the quality of being able to explode.