engine is a mean of neutral for scattering in an pipe
exhaust_pipe is pipe. reaction_propulsion_engine is engine. jointed_charlock is weed. engine is non_agentive_artifact. scattering is natural_process. scattering is spreading. pipe is hollow_cylindrical_object. dispersion_of_stuff is scattering. null_pointer_offset_error is running_computer_process. engine_failure is breakdown.