Domain: Natural Science — Atmospheric Science
Target concept: Cooling moist air in a transparent chamber leads to earlier condensation compared to cooling dry air.

Video generation prompt: Place two identical transparent sealed chambers side by side, with the left one marked in red and the right one marked in blue; introduce steam into the red chamber while keeping the blue chamber dry, and then cool both chambers simultaneously.

Evaluation guide:
(i) Target concept: Differential condensation onset driven by initial vapor load.
Minimum mechanism: Presence of supersaturated water vapor in red chamber → reaches dew point at warmer temperature → condenses first upon cooling; dry air in blue chamber requires greater cooling to reach its lower dew point → condenses later.
(ii)Storyline: [Frame 0–2] Two identical transparent chambers side-by-side, red-marked left (filled with visible steam), blue-marked right (empty/clear interior); [Frame 3–5] Cooling initiates synchronously (e.g., ambient dimming + surface frosting cues); [Frame 6–8] Droplets nucleate and grow on interior surfaces of red chamber; blue chamber remains clear; [Frame 9–10] Droplets become clearly visible in red chamber while blue chamber still shows no interior condensation, establishing observable temporal priority. Fixed frontal viewpoint; no occlusion; all phenomena occur within chamber volumes; steam never escapes; condensation never appears externally before interior onset.

Manual:
Experimental Procedure
1. Place two identical transparent sealed chambers side-by-side: left marked red, right marked blue.
2. Introduce steam into the red chamber only; ensure blue chamber remains dry.
3. Cool both chambers simultaneously using identical external cooling.
Observation of Experimental Phenomena
Condensation (liquid droplets) appears earlier and more densely on interior surfaces of the red (steam-filled) chamber than on the blue (dry) chamber.
Summary of Experimental Principles
Cooling moist air in a transparent chamber leads to earlier condensation compared to cooling dry air because higher water vapor concentration raises the dew point temperature, so the moist air reaches its condensation point with less cooling than the dry air needs.

Prompt Grounding rubric:
level_1: Only one sealed transparent chamber is shown, or the two chambers aren't placed side by side, or neither carries a red/blue marking, or no steam is introduced anywhere, or no cooling step is depicted, or the two chambers don't look identical to each other.
level_2: Two side-by-side chambers appear, but at least one of these is wrong: the left one isn't marked red, the right one isn't marked blue, steam isn't confined to the left chamber, the right chamber isn't clearly dry, or nothing in the video shows both chambers being cooled at the same time.
level_3: Two identical, sealed, transparent chambers sit side by side: the left one is marked red and visibly holds steam, the right one is marked blue and is visibly dry inside; both chambers are shown undergoing cooling at the same time (e.g., both develop frost, or both sit in the same cold airflow).
level_4: Everything in the 3-point description holds, and in addition the red and blue markings are clear, legible, and fixed to the outside of their chambers (not floating overlays); the steam stays fully inside the left chamber and never drifts into the right chamber or the surrounding air; the two chambers begin cooling at recognizably the same point in time, even if the amount of condensation later differs between them.
level_5: Everything in the 4-point description holds, and in addition the two chambers keep the same fixed side-by-side arrangement for the entire video, with no shifting, tilting, or repositioning; the red and blue markings stay on the same faces throughout; the steam inside the left chamber moves naturally (gently drifting or settling) but never becomes ambiguous about which chamber it's in; both chambers are shown starting the cooling process at the same recognizable moment (e.g., an external cooling apparatus or cue activates for both simultaneously), even as their internal condensation timelines immediately diverge and the two chambers never visually match each other thereafter.

Scientific and Causal Correctness rubric:
level_1: Neither chamber shows condensation; or condensation shows up first in the dry (blue) chamber; or both chambers fog up identically with no timing difference; or the red chamber starts out without steam and only gets steam partway through.
level_2: Both chambers eventually show condensation, but the timing is either impossible to tell apart or backwards (the blue chamber fogs at the same time as or before the red one); or steam shows up in both chambers; or the red chamber has no steam at the very start of the video; or condensation only ever appears on the outside of the chambers, never on the inside.
level_3: Condensation shows up earlier inside the red (steam-filled) chamber than inside the blue (dry) chamber; steam is present only in the red chamber at the start; the blue chamber's inside stays clear and dry until its own, later condensation begins; both chambers' condensation appears on their inner surfaces, not just as outside fogging.
level_4: Everything in the 3-point description holds, and in addition the red chamber's condensation shows up as distinct, growing droplets on the inner glass (not a uniform haze); the blue chamber's later condensation is also droplets, not a mist or film; neither chamber shows outside condensation before its inside condensation begins; the red chamber's droplets clearly build up faster or denser than the blue chamber's during the period when both are visible.
level_5: Everything in the 4-point description holds, and in addition droplets start forming in the red chamber before any moisture at all appears inside the blue chamber; at every comparable moment, the red chamber's droplets are bigger and more numerous; there is no point where the two chambers look the same; nothing else (evaporation, mixing, an obvious added mist effect) could explain the difference except the chain that actually applies here: steam in the red chamber means more water vapor, which means a higher dew point, so it reaches its condensation point sooner on cooling than the dry blue chamber does.

Spatiotemporal Consistency rubric:
level_1: A chamber vanishes, appears out of nowhere, or jumps to a new position/orientation between frames; the room lighting snaps from one state to another with no transition (e.g., a sudden flash, an instant blackout, a spotlight appearing from nowhere); a chamber flips between looking transparent and opaque; or the steam disappears and reappears with no continuous transition.
level_2: At least one clear flaw: a chamber's edges bulge, pinch, or otherwise warp unnaturally; steam passes straight through a chamber wall or vanishes mid-air with no dissipation; condensation appears instantly rather than building up; or the red/blue markings detach, float free, or change size oddly.
level_3: Neither chamber teleports, breaks apart, nor is hit by a sudden lighting change; no frames are dropped or stutter; steam stays within the left chamber's walls as it moves; condensation builds up gradually on the inside of both chambers; the red and blue markings stay put and legible; both chambers keep looking like solid, plausible glass or acrylic containers (no odd reflections or sudden opacity).
level_4: Everything in the 3-point description holds, and in addition the steam's motion (where visible) looks smooth rather than jerky or stop-motion; condensation builds up gradually rather than jumping straight from bare glass to full coverage; the same light source and shadow pattern apply to both chambers throughout; the markings stay aligned with their chamber faces even through any small camera movement.
level_5: Everything in the 4-point description holds, and in addition motion throughout looks fluid, with no stutters, ghost trails, or jagged edges on the moving steam or growing droplets; both chambers keep their shape and proportions correctly through the whole video, with no stretching or shearing; light interacts with the steam and droplets in a believable way (steam scatters light softly, droplets catch sharper highlights); and the left/right, front/back arrangement of everything on screen stays clear and unambiguous in every frame.