Which of the following is NOT a basic type of explosion?

Plasma is not considered a basic type of explosion because it does not fit within the conventional categories typically used to classify explosive events. The three recognized basic types of explosions are mechanical, chemical, and nuclear.

Mechanical explosions occur when a physical process leads to a rapid release of energy, often due to the sudden failure of a pressure vessel or a similar structure. Chemical explosions involve a rapid reaction between chemicals that produces gas and heat, resulting in an explosive force. Nuclear explosions, on the other hand, involve a reaction at the atomic level, usually through fission or fusion, leading to a massive release of energy.

Plasma, while it can be generated by explosive events or certain reactions, is a state of matter consisting of ionized gases rather than a distinct category of explosion itself. Thus, it does not belong in the same classification as mechanical, chemical, or nuclear explosions.