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A small zinc strip sits in a beaker of clear acid behind a safety shield. Fine bubbles rise steadily from the metal with a soft continuous fizz.

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Per-prompt rubric

Basic standards

Visual presence

  • a zinc strip
  • a beaker
  • clear acid
  • a safety shield

Event: a zinc strip sits in acid and releases bubbles

Audio presence

  • bubbles in acid

Sound: soft continuous fizz

Key standards

Visual physical commonsense (V-PC)

  • A zinc strip sits in a beaker of liquid behind a safety shield, with the strip remaining at a stable length throughout the clip.
  • Fine bubbles rise steadily from the zinc strip in a plausible upward trajectory.

Audio physical commonsense (A-PC)

  • The dominant audible sound is a soft continuous fizz consistent with slow gas generation.

Cross-modal physical commonsense (AV-PC)

  • The continuous fizz is present throughout the time that bubbles are visibly rising from the zinc.