Domain: Engineering — Energy Engineering
Target concept: Hot water in a thermos compared to a metal cup, producing steam over time

Video generation prompt: Place an insulated travel mug next to a metal mug, pour freshly boiled water into both, keep them uncovered, and observe over time.

Evaluation guide:
(i) Target concept: Differential rate of evaporative cooling driven by thermal conductivity and insulation efficacy.
Minimum mechanism: Boiled water must be at near-100°C; metal must have high thermal conductivity (>20 W/m·K) enabling rapid surface cooling and vapor condensation dynamics; insulated container must impede conductive/convective heat loss, sustaining higher surface temperature longer and suppressing immediate vapor nucleation.
(ii)Storyline: Phase 1 (Placement): Two distinct mugs enter frame side-by-side, stationary, uncovered, no steam. Phase 2 (Pouring): Clear liquid stream enters each mug, no spillage, no lid contact. Phase 3 (Early Observation): Within first few seconds post-pour, vigorous steam rises from metal mug only; insulated mug shows no steam or only faint wisp. Phase 4 (Mid Observation): Metal mug steam visibly thins and collapses; insulated mug steam begins rising: lower, slower, sustained. Phase 5 (Late Observation): Metal mug steam fully absent; insulated mug steam remains faintly visible until video end. Perspective: Fixed frontal medium shot, full mugs in frame, no occlusion, consistent lighting, eye-level viewpoint.

Manual:
Experimental Procedure
1. Place an insulated travel mug and a metal mug side-by-side on a flat surface, both uncovered.
2. Pour freshly boiled water into both mugs simultaneously or sequentially.
3. Keep both mugs uncovered and stationary; observe for visible steam emergence and dissipation.
Observation of Experimental Phenomena
Steam appears first and more vigorously over the metal mug, then diminishes quickly; steam appears later and less vigorously over the insulated mug, persisting longer.
Summary of Experimental Principles
Insulation reduces heat transfer: the metal mug loses heat rapidly to surroundings, causing rapid steam production followed by quick cooling; the insulated mug retains heat longer, delaying steam onset and reducing its intensity due to slower surface cooling.

Prompt Grounding rubric:
level_1: No insulated travel mug and no metal mug present; or only one mug type appears; or mugs are not placed side-by-side in same frame; or no freshly boiled water is poured into either; or mugs are covered or capped at any point.
level_2: Both mug types are present and placed adjacent in same frame, but at least one of the following is missing: (a) freshly boiled water being poured into both, (b) both mugs remain uncovered throughout, (c) placement occurs before pouring, (d) mugs are not stationary during observation phase.
level_3: Insulated travel mug and metal mug are placed side-by-side in same frame, both are uncovered, freshly boiled water is visibly poured into both, and both mugs remain stationary and uncovered for the duration; all steps occur in correct sequence: placement → pouring → still observation.
level_4: All conditions for score 3 are satisfied, and additionally: (a) both mugs are clearly distinguishable by shape/texture (e.g., insulated mug has lidless cylindrical body with visible insulation layer or rubberized grip; metal mug shows bare metallic sheen), (b) pouring action is shown for each mug separately or simultaneously with clear liquid stream entering each, (c) no extraneous objects occlude either mug during full observation window.
level_5: All conditions for score 4 are satisfied, and additionally: (a) both mugs maintain consistent spatial relationship (side-by-side, fixed relative position) without shift, rotation, or repositioning, (b) pouring is completed before observation begins (no pouring overlaps with steam emergence), (c) no visual artifact interrupts continuity, e.g., no cut, flash, zoom, or camera reframe between placement, pouring, and observation phases.

Scientific and Causal Correctness rubric:
level_1: No steam appears over either mug at any time; or steam appears identically over both mugs simultaneously and continuously; or steam appears only over insulated mug; or steam appears before pouring or after observation ends.
level_2: Steam appears over at least one mug, but violates causal logic: (a) steam emerges before water is poured, (b) steam appears over insulated mug earlier than or at same onset time as metal mug, (c) steam persists continuously over insulated mug while vanishing from metal mug, (d) steam is visually identical in density, height, and motion over both mugs throughout.
level_3: Steam appears first over the metal mug and later (with observable delay) over the insulated mug; steam over metal mug diminishes or disappears before steam over insulated mug appears; both mugs show steam only after pouring and only while uncovered.
level_4: All conditions for score 3 are satisfied, and additionally: (a) steam over metal mug is visibly more vigorous (higher rise, greater dispersion, faster dissipation) than steam over insulated mug, (b) steam over insulated mug appears fainter, lower, slower-rising, and longer-persisting, (c) no steam appears during pouring; onset occurs only after pouring completes and mugs settle.
level_5: All conditions for score 4 are satisfied, and additionally: (a) steam over metal mug ceases completely before steam over insulated mug reaches peak visibility, (b) steam over insulated mug remains present (even if faint) while metal mug steam is fully absent, (c) no reversal: steam never reappears over metal mug after initial dissipation, and never vanishes from insulated mug before video ends.

Spatiotemporal Consistency rubric:
level_1: Mugs teleport between frames; or change size/shape abruptly; or disappear/reappear; or lighting shifts drastically (e.g., daylight to night) mid-sequence; or shadows flicker inconsistently; or background geometry warps.
level_2: At least one major spatiotemporal flaw: (a) mug positions shift significantly without motion continuity (e.g., jump-cut repositioning), (b) steam appears/disappears instantaneously without fade or dispersion motion, (c) pouring stream disconnects from kettle/spout or floats unsupported, (d) reflection/specular highlights vanish or invert without cause.
level_3: All objects maintain stable position, scale, and orientation; steam exhibits continuous emergence and dissipation motion (no teleportation or freezing); pouring stream connects continuously from source to mug; lighting and shadow remain consistent in direction and intensity across entire video.
level_4: All conditions for score 3 are satisfied, and additionally: (a) steam motion is physically coherent, rising vertically with gentle lateral drift, not horizontal spread or downward flow, (b) no object edge tearing, inter-frame jitter, or ghosting; (c) mug surfaces show consistent material appearance (e.g., metal reflects ambient light, insulated surface diffuses light), (d) no temporal compression/expansion: motion speed remains uniform (no speed-up/slow-down).
level_5: All conditions for score 4 are satisfied, and additionally: (a) steam from each mug originates precisely above its rim (no offset origin), (b) no parallax inconsistency: foreground/background depth relationships remain stable, (c) no frame duplication, skipped frames, or stutter in motion: every visible motion step is smooth and incremental.