Domain: Natural Science — Atmospheric Science
Target concept: A cooled surface plate comes into contact with warm, moist air, forming a visible fog layer.

Video generation prompt: A cold, flat metal plate placed on a table is gently blown over by warm, humid air.

Evaluation guide:
(i) Target concept: Surface condensation of water vapor due to thermal contact between unsaturated warm humid air and a sub-dew-point cold surface.
Minimum mechanism: Plate temperature must be below dew point of incoming air; air must contain sufficient water vapor; surface must be thermally conductive and non-porous to enable rapid heat transfer and droplet nucleation.
(ii)Storyline: [Phase 1] Static shot: cold metal plate resting undisturbed on tabletop. [Phase 2] Airflow initiation: humid air source enters frame from side and makes contact with plate upper surface. [Phase 3] Immediate response: fog layer appears uniformly across plate surface *only during* airflow. [Phase 4] Cessation: airflow ends → fog vanishes fully within same continuous shot. [Perspective constraint] Fixed frontal/slightly angled view showing plate top surface, airflow path, and fog layer in full frame; no occlusion of contact zone; lighting enables clear differentiation of fog transparency vs. plate reflectivity.

Manual:
Experimental Procedure
1. Place a clean, flat, metallic plate on a dry tabletop.
2. Generate warm, humid air (e.g., via human exhalation or humidifier nozzle) and direct it gently across the upper surface of the plate.
Observation of Experimental Phenomena
A thin, uniform, whitish, semi-transparent fog layer forms instantly on the plate surface during airflow and vanishes completely within 1 second after airflow stops.
Summary of Experimental Principles
When warm, moisture-laden air contacts a cooled surface, water vapor condenses into microscopic liquid droplets, forming visible fog—a phase change driven by temperature differential and surface nucleation.

Prompt Grounding rubric:
level_1: No cold metal plate visible; no warm humid air source (e.g., no visible breath, steam plume, or fog-generating device); no tabletop surface; no demonstration of blowing action over the plate.
level_2: A flat metallic-looking object is present on a surface, and some airflow motion (e.g., hand movement or fan blur) occurs near it, but the object is not clearly identifiable as a cold metal plate (e.g., wrong material appearance like plastic or wood), and no visible humid air interaction is shown.
level_3: A flat, metallic-colored plate is placed on a tabletop; an airflow action (e.g., visible exhalation plume, misty breath, or steam-like emission) moves across the top surface of the plate; all three core objects (plate, table, humid air source) are present and spatially co-located in one continuous scene.
level_4: All elements from 3-score are present AND the airflow originates from a direction consistent with gentle blowing (e.g., human mouth or nozzle positioned adjacent to, not above or beneath, the plate’s upper surface); plate remains stationary throughout; no extraneous objects occlude the plate–air contact zone during airflow.
level_5: All elements from 4-score are present AND the humid air source is unambiguously anthropogenic (e.g., human mouth with clear lip shape and breath plume) or device-based (e.g., labeled humidifier nozzle) positioned at the side of the plate; plate has reflective metallic sheen and sharp rectangular/circular geometry; table is flat, neutral-toned, and fully supports the plate without overhang or tilt.

Scientific and Causal Correctness rubric:
level_1: No visible condensation or fog formation on the plate; plate surface appears dry, glossy, or unchanged throughout; no state change observed between pre-airflow and airflow phases.
level_2: A transient visual artifact (e.g., lens flare, dust motes, or unrelated vapor) appears near the plate, but it is not localized to the plate surface and shows no adherence, persistence, or temperature-gradient correlation with airflow timing.
level_3: A thin, semi-transparent, whitish layer appears exclusively on the upper surface of the plate during airflow and disappears within 1 second after airflow stops; layer is continuous (not patchy or fragmented) and conforms to the plate’s shape; no liquid droplets or runoff observed.
level_4: All elements from 3-score are present AND the fog layer appears only after airflow begins (no pre-existing fog), persists only while airflow is active, and vanishes fully within the same continuous shot after airflow ceases; fog does not extend beyond the plate’s lateral edges or rise vertically away from the surface.
level_5: All elements from 4-score are present AND the fog layer exhibits uniform opacity and edge definition across the entire plate surface; no color shift (e.g., blue tint or yellow haze); no distortion, bubbling, or granular texture inconsistent with water vapor condensate; fog forms synchronously across the whole surface upon airflow onset, not sequentially from one edge.

Spatiotemporal Consistency rubric:
level_1: The plate instantly changes position, size, or orientation with no connecting motion; the fog layer appears at full density in a single frame before any airflow has reached the plate, or remains visible after the air source has been withdrawn entirely from frame; the airflow stream visibly runs backward into its source; the shot's lighting switches between two unrelated states with no transition; or an object in the background or foreground flickers, vanishes, or reappears with no continuous motion connecting the two states.
level_2: At least two of the following occur: the fog blinks fully on or fully off within a single frame instead of building or clearing gradually; the airflow source (mouth or nozzle) enters and exits frame with no continuous stream ever reaching the plate; the plate's position or tilt changes between frames with no visible cause; or fog is already visible on the plate before the airflow has reached it.
level_3: One continuity break occurs: e.g., a hard cut appears between the airflow first touching the plate and the fog being fully formed, with no visible in-between growth; the fog's edge briefly extends past the plate's rim and then snaps back inward within a single frame; or the airflow stream's path bends at an angle inconsistent with the source's position for a moment.
level_4: No instant fog on/off flicker and no hard cuts between airflow onset and fog dissipation; the fog visibly grows from the moment the airflow reaches the plate and visibly recedes as the airflow source is withdrawn, but one small flaw remains, e.g., the fog's outer edge wavers briefly beyond the plate's rim, or the visible density of the airflow stream changes abruptly instead of tapering off as it ends.
level_5: The fog's appearance is visibly synchronized with the airflow first reaching the plate, its coverage visibly grows as the airflow continues, and its clearing visibly tracks the airflow being withdrawn; the fog's boundary stays aligned with the plate's edges throughout, with no perceptible drifting, growing, or shrinking that the airflow timing doesn't explain; the plate and table remain fixed in position for the entire shot.