Domain: Natural Science — Physics
Target concept: Water jets emerging from holes at different heights on a clear plastic bottle

Video generation prompt: A transparent plastic bottle has three small holes drilled at different heights. As water flows out of the bottle, water jets will emerge from these holes.

Evaluation guide:
(i) Target concept: Hydrostatic pressure dependence on depth in a static fluid column, and how that pressure combines with projectile fall time to set each jet's horizontal landing range (Torricelli's law).
Minimum mechanism: Water must be initially static and continuous; holes must be open to atmosphere; gravitational acceleration must act downward; bottle wall must be rigid and impermeable except at holes; fluid must be Newtonian and cohesive enough to form sustained jets.
(ii)Storyline: [Phase 1] Bottle is upright and full, water surface horizontal and still; no jets. [Phase 2] Holes uncovered → pressure-driven outflow begins promptly: jets emerge from all three holes at essentially the same time. [Phase 3] Jets stabilize into continuous streams: the middle hole's jet reaches farthest horizontally, while the top and bottom jets both land closer to the bottle and visibly shorter than the middle jet; this middle-longest pattern becomes clearly discriminable and persists. [Phase 4] Water level gradually falls: all three jets weaken and shorten together, but the middle jet continues to reach farther than the top and bottom jets until the water level drops below the top hole and, later, the middle hole. Perspective constraint: Fixed frontal-side view showing full bottle height, all three holes, and full jet extents without occlusion; lighting enables clear differentiation of jet lengths and hole positions.

Manual:
Experimental Procedure
1. Fill a transparent plastic bottle with clear water to near the top.
2. Drill three small, round holes at visibly different heights on the same side surface, spaced across the bottle's height (near the bottom, near the middle, and near the top).
3. Remove finger covering holes and allow water to drain freely.
Observation of Experimental Phenomena
Three water jets emerge simultaneously from the holes; the jet from the middle hole travels the farthest horizontally (longest jet), while the jets from the bottom and top holes both land closer to the bottle and are visibly shorter than the middle jet.
Summary of Experimental Principles
By Torricelli's law, exit speed from a hole increases with the depth of water above it, so the lowest hole has the fastest exit speed; however, horizontal jet range also depends on how long the water has to fall before landing, and the lowest hole's water falls only a very short distance. Horizontal range is proportional to the square root of (depth-below-surface × height-above-base), which is maximized at the hole nearest mid-height and falls off toward both the top and bottom of the bottle — so the middle hole, not the bottom hole, produces the longest jet.

Prompt Grounding rubric:
level_1: No transparent plastic bottle is shown; no holes are visible on it; no water jets appear; there is no sign of water flowing out of the bottle at all.
level_2: A bottle is shown but is not transparent (e.g., opaque, tinted, or frosted); or only one hole is visible; or water is inside the bottle but no jet emerges from any hole; or a jet appears without any bottle shown.
level_3: A transparent plastic bottle is shown with three visible holes at different vertical positions on its side, and water flows out forming jets; but at least one jet is missing, the holes are not actually at different heights (e.g., arranged in a horizontal row instead), or a jet is shown coming from the wrong hole (e.g., a jet appears at the top but not at the bottom).
level_4: A transparent plastic bottle is shown with exactly three distinct, clearly visible holes at visibly different heights on the same side; water jets emerge continuously from all three holes during the drainage; there are no extra holes, no missing jets, and no jet is attributed to the wrong hole; but a minor flaw remains, such as the bottle being tilted enough to make the hole-height order slightly ambiguous, or one jet being very briefly hidden from view without preventing it from being clearly seen for most of the drainage.
level_5: A transparent plastic bottle is shown with exactly three small, round, unobstructed holes on the same side at three clearly distinguishable heights (top, middle, bottom); water jets emerge at essentially the same time and each jet continues for as long as the water level remains above its hole, weakening and stopping only once the water level naturally falls below that hole; each jet is clearly seen originating from its own hole; there are no extra objects, no occlusion, and no ambiguity about how many holes there are, where they are, or which jet belongs to which hole.

Scientific and Causal Correctness rubric:
level_1: No causal relationship is shown between holes and jets: jets do not originate from the holes, or water flows without any jet exiting, or a jet appears with no water inside the bottle, or the jet lengths show no relation to hole position at all (e.g., all three jets are visibly identical in length, giving no evidence of any pressure/height effect).
level_2: At least two of the three jets are absent or clearly come from the wrong hole; or the middle-hole jet is not longer than the top-hole jet and not longer than the bottom-hole jet (i.e., the middle jet fails to stand out as the farthest-reaching); or jets exit as rigid rods or isolated droplets rather than coherent streams.
level_3: All three jets emerge from their respective holes, but the middle jet is not clearly the longest of the three: e.g., the bottom jet reaches as far as or farther than the middle jet, or the top jet reaches as far as or farther than the middle jet; or jet formation is intermittent/discontinuous for at least one jet.
level_4: All three jets emerge continuously; the middle-hole jet is visibly the longest (reaches farthest from the bottle) of the three, and both the top and bottom jets are visibly shorter than the middle jet; all three are coherent liquid streams (not mist/spray-only); but one jet shows a minor shape irregularity (e.g., slight splaying) that does not change this length ranking.
level_5: All three jets emerge continuously as coherent streams for as long as the water level stands above their hole; the middle-hole jet is unambiguously the longest/farthest-reaching of the three, and the top and bottom jets are both visibly shorter than the middle jet (and roughly comparable to each other in length) for the entire time all three are active; no jet stops or loses coherence while water still stands above its hole: any jet ending happens only as an expected result of the water level draining past that hole; all jets originate solely from their hole openings with no leakage elsewhere.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal violation: the bottle jumps to a different position or shape between shots; a hole appears or disappears partway through the video; a jet starts or stops instantly with no visible transition; the room lighting flips abruptly (e.g., bright to dark) between consecutive moments; the bottle visibly deforms, tears, or fractures during the drainage.
level_2: Moderate violation: a jet appears already fully formed in a single moment rather than growing out of its hole; the bottle visibly shifts or rotates by more than about 10% of the frame width between the start and later parts of the video; the shadow the bottle casts swaps to the opposite side without the light source moving; the water level drops in a sudden jump rather than a gradual descent.
level_3: Minor but noticeable break: one jet very briefly flickers or stutters before resuming its stream; the bottle's position or tilt shifts slightly and visibly between the early and later parts of the drainage; the water level's descent looks slightly uneven (a small stair-step rather than smooth), but with no tearing or lighting reversal.
level_4: The bottle stays in the same position and orientation throughout; the three holes keep the same relative vertical arrangement; each jet grows smoothly out of its hole and flows without interruption; the water level falls gradually and only in one direction (never rising); the direction and brightness of the lighting and the bottle's shadow stay the same from start to end; but one small artifact remains (e.g., a single brief blur at a jet tip that doesn't change how long the jet looks).
level_5: No visible spatiotemporal artifacts: the bottle is fully visible and completely still throughout; the three holes' relative positions never appear to shift; each jet starts with a natural, gradually accelerating flow, sustains a steady stream, and only weakens as the water level naturally drains past its hole; the water level recedes smoothly and continuously; lighting, the bottle's shadow, and any reflections on the water stay physically consistent throughout, with no visible jump, warp, or viewpoint change at any point.