Domain: Natural Science — Physics
Target concept: Immerse the sealed bottle in water for leak testing.

Video generation prompt: Two transparent, lid-covered plastic bottles are inverted and submerged in a transparent water tank, one intact and the other with a small pinhole on its side, held steadily by a gloved hand.

Evaluation guide:
(i) Target concept: Leak detection via air escape under hydrostatic pressure in a sealed container.
Minimum mechanism: A submerged, inverted, air-filled, rigid container with a side aperture will expel air as discrete buoyant bubbles due to pressure differential between interior air and surrounding water; absence of aperture prevents air escape and preserves internal air volume.
(ii)Storyline: [Frame 0–2] Bottles lowered into water, fully inverted, lids down; [Frame 3–4] Both bottles fully submerged, side-by-side, motionless; [Frame 5–8] Continuous bubble stream originates solely from side of one bottle, rising vertically; [Frame 6–9] Air–water interface inside pinhole bottle descends steadily; intact bottle interface remains fixed at top; [Perspective] Fixed frontal/side view showing full bottle height, pinhole region, and bubble path; [Visibility] No occlusion of bottle sides, lids, or bubble origin; water clarity permits unambiguous tracking of air volume and bubble emission.

Manual:
Experimental Procedure
1. Fill transparent water tank with clear water.
2. Prepare two identical transparent plastic bottles with tightly sealed lids.
3. Pierce one bottle with a single small pinhole on its side; leave the other intact.
4. Invert both bottles and submerge them side-by-side in water tank, holding upright with gloved hands.
Observation of Experimental Phenomena
Air bubbles emerge continuously and exclusively from the pinhole on the test bottle’s side; no bubbles appear from the intact bottle. Water gradually enters the pinhole bottle from below, lowering its internal air volume; the intact bottle retains full air volume.
Summary of Experimental Principles
Immersing a sealed bottle in water tests for leaks: if a pinhole exists, hydrostatic pressure forces air out through the aperture, producing visible bubbles — confirming loss of seal integrity.

Prompt Grounding rubric:
level_1: No water tank is shown; no two lid-covered, transparent plastic bottles appear; no gloved hand holds them; neither bottle is inverted or submerged; there is no way to tell which bottle, if either, has a pinhole.
level_2: A water tank and at least one bottle appear, but not both bottles are transparent, lid-covered, inverted, and submerged, or no gloved hand is holding them; the two bottles are never shown together in the same shot for comparison.
level_3: Both bottles are transparent, lid-covered, inverted, and fully submerged in the same water tank shot, held steadily by a gloved hand; the two bottles sit side by side and are clearly visible; one bottle carries some external mark or label suggesting it is the test bottle, though no actual pinhole is visible yet.
level_4: Everything in the 3-point description holds, and in addition a small, distinct mark (a visible break, dot, or irregularity matching the expected size and location of a pinhole) appears on the side of exactly one bottle, with no such mark on the other.
level_5: Everything in the 4-point description holds, and in addition both bottles match each other in shape, size, and color; both lids look identically and fully sealed; the tank walls are clear enough that no glare hides either bottle's side; the gloved hand's grip does not cover the pinhole area or the lid on either bottle; the pinhole is visible on only one bottle's side, with no confusion about which bottle is which.

Scientific and Causal Correctness rubric:
level_1: No bubbles form, no water enters either bottle, and both bottles look identical inside (both full of air, or both full of water); nothing links the pinhole to any observable difference between the bottles.
level_2: Bubbles appear, but not from the pinhole bottle's side wall (e.g. they come from the lid, the base, or outside the tank), or both bottles bubble equally, or water is seen entering a bottle with no accompanying bubbles.
level_3: A steady stream of air bubbles rises only from the side of the pinhole bottle while submerged; the intact bottle produces no bubbles from any surface; the pinhole bottle's trapped air pocket visibly shrinks over time while the intact bottle's air pocket stays full; the contrast between the two bottles is unambiguous.
level_4: Everything in the 3-point description holds, and bubble release begins as soon as the pinhole bottle is fully submerged and continues without pausing; no bubbles appear before submersion or after the bottles are lifted out; the intact bottle never emits a single bubble at any point.
level_5: Everything in the 4-point description holds, and bubble size, spacing, and rise path are consistent with buoyant air escaping from one fixed point on the pinhole bottle's side, with no stray bubbles from the tank walls or the hand; the intact bottle's internal air-water boundary stays flat and fixed at the top the whole time; the pinhole bottle's air-water boundary steadily drops as air escapes, matching the expected effect of hydrostatic water pressure forcing air out through a small opening.

Spatiotemporal Consistency rubric:
level_1: A bottle or the gloved hand vanishes and reappears, or the two bottles swap places between frames; a bottle's outline breaks apart or misaligns from one frame to the next; the scene lighting swings abruptly from bright to dark (or the reverse) between adjacent frames with no visible cause; the water surface disappears or flashes solid color; the bubble stream cuts out and restarts with no visible cause.
level_2: A bottle or the hand visibly wobbles or drifts beyond ordinary handheld movement; the pinhole region is hidden for more than a frame at a time, obscuring whether bubbles are forming; ripples distort a bottle's outline into an unrecognizable shape for more than two consecutive frames; a bottle's lid visibly rotates or slips loose between frames.
level_3: Both bottles keep the same side-by-side arrangement, depth, and tilt for the whole clip; the gloved hand keeps the same grip and bottle orientation without repositioning; the water stays level and unbroken across the tank; neither bottle's shape buckles or warps; no sudden jump in brightness or shadow breaks the shot.
level_4: Everything in the 3-point description holds, and in addition no motion blur hides the bubble-emission point or bottle surface texture; the camera framing shows no parallax drift between the two bottles; water clarity and the refraction along the tank walls stay the same from frame to frame; the gloved hand shows no tremor or re-grip at any point.
level_5: Everything in the 4-point description holds, and in addition the bottle outlines stay crisp and continuous with no blur, warping, or doubled edges; bubbles trace a smooth, gently curving upward path with no kinks or jumps; the meniscus at the pinhole bottle's submerged opening stays put and undisturbed; reflections on the water surface and tank walls stay geometrically consistent and do not flicker.