Domain: Natural Science — Physics
Target concept: The water level inside the cup rises higher than the water level outside the cup.

Video generation prompt: Place an open basin on the table, filled with water up to half its volume; light a candle and place it in the basin so that it floats on the water surface; cover the candle with a transparent cylindrical cup whose opening is slightly larger than the candle.

Evaluation guide:
(i) Target concept: Atmospheric pressure differential driving liquid displacement after thermal gas contraction.
Minimum mechanism: (1) Cup must be sealed *only* by water seal (no physical lid), (2) Candle flame must fully extinguish *before* water rise initiates, (3) Air inside cup must be initially at ambient pressure and temperature, (4) Water must be in direct contact with cup interior base to form pressure-transmitting seal.
(ii)Storyline: [Phase 1: Setup] Basin placed flat → water poured to mid-height → candle lit → candle placed to float freely. [Phase 2: Enclosure] Cup lowered vertically, maintaining alignment, until fully enclosing candle with opening down and base contacting water. [Phase 3: Combustion & Extinction] Flame burns steadily, then dims uniformly and extinguishes completely; no residual glow. [Phase 4: Pressure Equalization] *Only after extinction*, water begins rising continuously inside cup; no motion during burning. [Phase 5: Equilibrium] Rise halts; final water column inside cup is stably higher than outside level; all surfaces remain calm and horizontal. Perspective: Fixed frontal view, full basin and cup visible, no occlusion, consistent lighting, water surface always in focus.

Manual:
Experimental Procedure
1. Place open basin on table; fill with water to ~half its interior height.
2. Light candle; place upright so it floats freely on water surface.
3. Position transparent cylindrical cup vertically over candle; lower it straight down until fully covering candle with opening facing down.
Observation of Experimental Phenomena
After candle flame extinguishes, water level inside the cup rises and becomes visibly higher than water level outside the cup.
Summary of Experimental Principles
The candle flame heats the air trapped inside the cup, causing it to expand, and some of this warmed air can escape past the water seal at the cup's rim while the candle burns. Once the flame goes out, the remaining trapped air cools and contracts, lowering the pressure inside the cup below the atmospheric pressure outside. This pressure difference then pushes water up into the cup until it is balanced, leaving the water level inside the cup higher than the water level outside.

Prompt Grounding rubric:
level_1: The scene is missing the basin, the water, the floating candle, or the transparent cylindrical cup outright, or one of these is replaced with something else entirely (e.g., a closed container instead of an open basin, or an opaque cup); at least three of these four required elements are absent or wrong.
level_2: Only two of the four required elements (the open basin, water filling roughly half the basin, an upright floating candle, and a transparent cylindrical cup with an opening slightly larger than the candle) are correctly shown; the rest are missing, of the wrong type (e.g., a bowl-shaped or opaque cup), or physically wrong (e.g., the candle rests submerged rather than floating, or the cup's opening is narrower than the candle).
level_3: All four elements are present and individually recognizable (an open basin on the table, water filling about half the basin, an upright candle floating on the water, and a transparent cylindrical cup slightly wider than the candle), but at least one spatial detail or the order of events is off: e.g., the cup is not centered over the candle, the basin sits at a tilt, the candle touches the basin's inner wall, or the cup is shown lowered into place before the candle is shown lit and floating.
level_4: All four elements are present, correctly typed, and correctly arranged: the basin sits level on the table, water fills about half its height, the candle floats upright and freely without touching the basin, and the cup is centered vertically over the candle with its opening down and its rim touching the water; the setup follows the prompt's order (basin, then water, then the lit floating candle, then the lowered cup) with only one small imperfection, such as the cup leaning a few degrees off vertical or the flame flickering unusually large or small for a moment.
level_5: All four elements are present, correctly typed, and precisely arranged for the entire video: the basin lies flat, the water sits visibly at half the basin's height, the candle floats upright and centered with a clearly visible wick and flame, and the cylindrical cup stands perfectly vertical, fully covering the candle, opening down, centered, and touching the water evenly on all sides; every element stays fully visible and unchanged in identity and position from the first frame to the last.

Scientific and Causal Correctness rubric:
level_1: The flame extinguishes but the water level inside the cup never ends up higher than the water level outside: either no rise happens at all, or the final level inside ends up level with or lower than outside.
level_2: The water level inside the cup does end up higher than outside by the end of the video, but the rise clearly begins before the flame has fully gone out (e.g., while the flame is still visibly shrinking or burning); the correct final outcome appears, but not for the right reason.
level_3: The water level inside the cup begins rising only after the flame has fully gone out, and ends up higher than the outside level (the cause-and-effect order and the outcome are both correct), but the demonstration is not fully convincing: e.g., the rise stalls partway and then resumes, or the difference between the inside and outside water levels is too subtle or obscured by glare to clearly confirm the result.
level_4: The water level inside the cup rises steadily and only after the flame has fully gone out, ending up clearly and stably higher than the outside level, matching the atmospheric-pressure mechanism; one secondary flaw remains, such as the water rising implausibly close to the cup's rim for the small amount of cooling shown, or a few stray bubbles appearing at the cup's base during the rise.
level_5: The water level inside the cup stays level with the outside water for as long as the flame burns, begins rising only once the flame is fully out, climbs steadily to a level clearly and stably higher than outside, and both water surfaces stay calm and flat once the rise ends: a clean, unambiguous demonstration of the pressure-differential mechanism with no visual contradiction of the underlying physics.

Spatiotemporal Consistency rubric:
level_1: The cup appears already lowered fully over the candle with no visible descent, the candle or the basin vanishes or appears with no camera motion to explain it, the room's overall brightness jumps from one level to a completely different one within a single cut, or the cup or basin visibly bends, warps, or melts out of its rigid shape.
level_2: Two or more of the following occur: the cup's descent onto the water skips between positions rather than moving continuously, the water surface flickers or shimmers in a way real water would not, the flame blinks out and relights more than once before its final extinguishing, or the basin's position shifts slightly between shots with nothing shown to move it.
level_3: One spatiotemporal flaw is present: for example, the cup's downward motion is smooth but ends with a small extra snap or bounce as it settles, or the water inside the cup rises as a single visible jump rather than a continuous climb, or the flame's brightness drops in one abrupt step right before going out instead of fading gradually.
level_4: The cup lowers onto the water in one continuous, unhurried motion, the flame's glow visibly shrinks and dims over a few seconds before going out rather than cutting off instantly, the water climbs inside the cup as one continuous rise without stalling or reversing, and the basin stays fixed throughout; the only imperfection is a brief, barely-noticeable flicker in a reflection on the glass or water that does not recur.
level_5: The cup's descent, the flame's fade to extinction, and the water's rise inside the cup are each a single continuous motion with no stalls, jumps, or reversals; the basin, candle, and cup keep the same size and shape throughout; the ambient light falling on the basin and table stays constant, and the only source of visible brightness change anywhere in the scene is the candle's own flame shrinking and going out, with no unexplained flicker, warp, or discontinuity elsewhere.