Domain: Natural Science — Physics
Target concept: Sublimation of dry ice at room temperature (direct transition from solid to gas)

Video generation prompt: On the lab bench, at room temperature, several pieces of dry ice are placed on the exposed tabletop and left undisturbed for several minutes.

Evaluation guide:
(i) Target concept: Sublimation of solid carbon dioxide (dry ice) at ambient pressure and temperature (≈25°C, 1 atm), and the visible condensation mist this produces.
Minimum mechanism: CO2 molecules at the surface of each dry ice piece gain enough thermal energy from the surrounding air to break free of the solid lattice and escape directly as CO2 gas, skipping the liquid phase because atmospheric pressure (1 atm) lies far below CO2's triple-point pressure (5.11 atm). The escaping CO2 gas itself is colorless and invisible. What becomes visible is a secondary effect: the intensely cold gas chills the surrounding humid air, causing ordinary atmospheric water vapor to condense into a fine mist of tiny droplets, the same effect seen when breath condenses in cold air. This mist, not the CO2 gas, is the correct thing to depict rising from each piece.
(ii)Storyline: Frame 0–1: Dry ice pieces rest motionless on the tabletop, solid, opaque white, and angular. Frame 2–3: A thin, whitish mist (condensed atmospheric moisture, not the CO2 gas itself) begins forming at the surface of each piece and drifting upward. Frame 4–7: Mist volume builds steadily from every piece; no piece shows wetness, pooling, or shape collapse. Frame 8–10: Mist keeps rising and dispersing into the room air; every piece keeps its angular shape, with any size reduction imperceptible over 10 s; no droplets, puddles, or color change appear on any piece. Perspective: fixed eye-level or slightly elevated viewpoint showing the full tabletop and the vertical rise of the mist; diffuse front/side lighting keeps the mist visible without glare.

Manual:
Experimental Procedure
1. Place 3–8 small, irregularly shaped dry ice pieces directly onto an exposed, clean lab bench tabletop.
2. Leave undisturbed with no contact or airflow.
3. Record for 10 seconds from a fixed frontal/side viewpoint.
Observation of Experimental Phenomena
A thin, whitish mist continuously forms at the surface of every dry ice piece and drifts upward before dispersing; no liquid pooling appears on the tabletop or on the pieces, and each piece keeps its solid, opaque-white, angular shape throughout.
Summary of Experimental Principles
Solid CO2 (dry ice) sublimes directly into gaseous CO2 at room temperature and atmospheric pressure, skipping the liquid phase because 1 atm lies below CO2's triple-point pressure (5.11 atm). The CO2 gas produced is itself colorless and invisible — the mist that becomes visible is ordinary atmospheric water vapor condensing into tiny droplets when it meets the intensely cold gas at each piece's surface; it is not the escaping CO2 itself.

Prompt Grounding rubric:
level_1: No dry ice pieces appear on a lab bench tabletop at all: e.g., the scene shows an empty bench, a different object standing in for dry ice, or there is no exposed tabletop (the pieces are submerged in liquid, held in a gloved hand, or shown outdoors or on a kitchen counter).
level_2: Dry ice pieces are visible but the basic setup is wrong: they sit inside a container, cup, or dish rather than directly on the open tabletop; or a hand, tongs, or tool is touching them; or the tabletop is largely hidden under cloth, paper, or a pre-existing fog bank; or the count of pieces is 0 or more than about 10.
level_3: 3 to 8 distinct, irregularly shaped dry ice fragments sit directly on an exposed, unobstructed lab bench tabletop with no tool or container touching them; the camera holds a fixed side-on or frontal view of the bench; no hand places or removes any piece during the recorded clip.
level_4: Everything required for score 3 holds, and in addition every dry ice piece stays completely still for the whole clip: no sliding, rolling, or repositioning; no hand, tool, or moving shadow ever enters the frame; and the camera itself never pans, tilts, or zooms.
level_5: Everything required for score 4 holds, and in addition the pieces keep the same relative spacing and the same visible size and shape (no visible melting-style rounding) from the first frame to the last, and no stray digital artifact (a glitch, a lens flare, or an obviously synthetic-looking fog burst) appears anywhere in the clip.

Scientific and Causal Correctness rubric:
level_1: No mist or fog effect appears near any dry ice piece for the entire clip (an inaccurate omission, since the extreme cold of subliming CO2 reliably condenses ambient moisture into a visible mist); or a piece visibly melts into a liquid puddle; or a piece changes color (turning blue, yellow, or iridescent); or the mist flows downward and pools on the tabletop instead of rising and dispersing.
level_2: Some mist is present but behaves inconsistently with the condensation effect: it appears at only one or two pieces while others show none at all; or it appears before any dry ice is placed on the bench; or it keeps rising unchanged after a piece has fully disappeared; or a piece visibly shrinks with no mist forming at its surface; or the mist has a hard, geometric edge (e.g., a perfect cone or cylinder) rather than a soft, irregular boundary.
level_3: A thin, whitish, low-density mist rises continuously from every dry ice piece at once, drifting gently upward; no liquid appears on the tabletop or on any piece; every piece stays solid and opaque white throughout, with no color change or bubbling.
level_4: Everything required for score 3 holds, and in addition the mist's density and upward drift look comparable across all the pieces (no piece emits noticeably more, less, or differently directed mist than the others); the mist disperses into the air rather than pooling on the bench; and every piece keeps sharp, angular edges with no visible surface rounding or smoothing.
level_5: Everything required for score 4 holds, and in addition the mist only begins once a piece is fully resting on the bench, and if a piece visibly shrinks within the clip, the mist keeps forming until that shrinking stops; the mist's fine, wispy texture stays consistent across all frames, with no single piece starting its mist noticeably later or stopping it earlier than the others.

Spatiotemporal Consistency rubric:
level_1: A dry ice piece vanishes or appears mid-clip with no visible cause; the tabletop surface visibly warps, cracks, or changes material (e.g., wood grain turning into a metal reflection); the room lighting snaps between noticeably different brightness or color casts from one moment to the next; or a piece slides or spins across the tabletop with nothing touching it.
level_2: A dry ice piece drops out of view for a couple of frames and then pops back in the same spot; the rising mist abruptly balloons or thins out with no gradual build-up; the tabletop's visible texture shifts partway through the clip; or a piece's cast shadow jumps to a new position while the room lighting itself hasn't moved.
level_3: Every dry ice piece keeps a stable position, shape, and orientation for the whole clip; the mist builds up gradually with no sudden jumps or freezes; the tabletop's lighting stays even across the clip with no sudden flashes; each piece's shadow keeps the same direction and softness throughout; and no piece appears to tear, clip through the tabletop, or morph in outline.
level_4: Everything required for score 3 holds, and in addition the mist's rise looks smooth and continuous, with no jerky starts/stops or sudden frame-to-frame jumps in how much of a piece the mist covers; and the fixed camera view shows no drifting or parallax that would suggest the camera itself moved.
level_5: Everything required for score 4 holds, and in addition the mist thickens at a steady, comparable pace across all the pieces rather than in fits and starts; no frame looks duplicated, ghosted, or so blurred that a piece's outline is lost; and the mist is never rendered as if it originates from somewhere other than the piece it's rising from (e.g., appearing to come from above or behind a piece instead of from its surface).