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A firecracker explodes inside a sealed vacuum chamber. A bright flash and paper fragments scatter visibly, but no bang reaches the observer.

C1-3-09 Steady State · sound_persistence principle: Vacuum / sound absence (Fluid)
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Per-prompt rubric

Basic standards

Visual presence

  • a firecracker
  • a vacuum chamber

Event: a firecracker detonates inside a vacuum chamber

Audio presence

  • a firecracker

Sound: silence

Key standards

Visual physical commonsense (V-PC)

  • A firecracker is clearly visible inside a sealed vacuum chamber and detonates with a bright flash and scattering paper fragments.
  • No flame appears during the detonation, the chamber walls remain intact with no debris or smoke passing through them, and the firecracker is fully consumed by the detonation.

Audio physical commonsense (A-PC)

  • The clip contains no audible sound throughout.

Cross-modal physical commonsense (AV-PC)

  • No audio sound coincides with the visible detonation.