Set of sound classes referring to sounds that are immediately understood by listeners as arising from specific objects (rather than being heard more literally as "sounds").
The sound of a machine designed to produce mechanical energy. Combustion engines burn a fuel to create heat, which then creates a force. Electric motors convert electrical energy into mechanical motion. Other classes of engines include pneumatic motors and clockwork motors.
The sound of a simple instrument usually consisting of metal cast in the shape of a hollow cup, whose sides form a resonator which vibrates in a single tone upon being struck by a "clapper" suspended within, or by a separate mallet or hammer.
The sound of a rapid increase in volume and release of energy in an extreme manner, usually with the generation of high temperatures and the release of gases.