Domain: Natural Science — Atmospheric Science
Target concept: Vertical convective column generated by a heated surface visualized by smoke

Video generation prompt: A flat metal plate is heated from below within a transparent enclosure, while smoke from a lit cigarette is released above it to visualize the air flow.

Evaluation guide:
(i) Target concept: Buoyancy-driven vertical convection initiated by surface heating.
Minimum mechanism: Air must be warmer at the plate surface than above it; smoke must act as passive tracer (non-buoyant itself); enclosure must suppress external drafts to isolate thermal forcing.
(ii)Storyline: [Phase 1: Setup] Flat metal plate is fully visible inside intact transparent enclosure. [Phase 2: Activation] Plate is heated (no visible flame/electric element, but thermal shimmer appears on surface). [Phase 3: Tracer introduction] Smoke is introduced *only* above plate, forming initial pool. [Phase 4: Convection onset] Smoke lifts vertically from surface, forming narrow column. [Phase 5: Column development] Column ascends continuously, widens gradually, remains centered and stable, with no recirculation or collapse. Perspective: Fixed frontal view showing full plate-smoke-enclosure vertical alignment; no occlusion; full column length always visible from base to tip.

Manual:
Experimental Procedure
1. Place a flat metal plate horizontally inside a transparent enclosure.
2. Heat the plate uniformly from below (heat source not visible).
3. Release cigarette smoke directly above the plate surface.
Observation of Experimental Phenomena
A continuous, upward-rising vertical column of smoke forms, anchored at the plate surface and extending straight upward within the enclosure; column remains coherent without lateral spreading or downward flow.
Summary of Experimental Principles
Heating the plate warms adjacent air, decreasing its density; buoyant force causes the warm air to rise, carrying smoke upward in a visible convective column — a direct visualization of vertical convection in atmospheric boundary layers.

Prompt Grounding rubric:
level_1: No flat metal plate is visible; or there is no transparent enclosure around it; or no cigarette or cigarette smoke is shown above the plate; none of these three elements (plate, enclosure, smoke) appear together in the expected arrangement.
level_2: At least one of the three elements is present (say, a flat surface or some smoke), but a key piece is wrong or missing: the plate isn't flat/metallic, the enclosure is opaque or missing, the smoke enters from below or beside the plate instead of from above, or the smoke's source doesn't read as a cigarette at all.
level_3: All three elements are present and correctly typed: a flat metal plate, a transparent enclosure that fully encloses it, and smoke released above the plate's surface; the sequence follows the posted setup: plate heated from below, then smoke released above it.
level_4: The smoke visibly comes from a recognizable lit cigarette (thin, cylindrical, held or mounted near the top of the enclosure) rather than an unidentified vapor source; the plate stays in place and fully inside the enclosure the whole time; and the smoke only starts appearing after the plate is already shown in position, not before.
level_5: The cigarette smoke is released from essentially one point or a narrow band centered above the plate rather than several scattered points; nothing inside the enclosure (support rods, mounts) blocks the view of the plate-to-smoke vertical alignment; the plate surface itself stays fully visible with no glare or fogging; and no hands, labels, or wires ever enter the frame.

Scientific and Causal Correctness rubric:
level_1: The smoke drifts downward, sideways, or just sits still with no upward column at all; the plate shows no sign of heating (no shimmer or haze above it); the smoke spreads out evenly in all directions with no upward bias, so there's no visible link between the heated plate and how the smoke moves.
level_2: The smoke does drift upward some of the time, but never settles into one coherent rising column: its motion looks chaotic or multi-directional; the plate looks cold with no visible heat distortion above it; and the smoke never becomes noticeably denser or more concentrated near the plate.
level_3: A single, continuous column of smoke rises straight up from the plate's surface and holds that vertical shape for a good stretch of the clip rather than just a brief puff; the smoke does not spread out sideways the way plain diffusion would, showing that upward, buoyancy-driven motion is dominating.
level_4: The column also flares outward gradually as it rises rather than staying a uniform width; its base sits right at the plate's surface with no visible gap; the column stays centered and doesn't bend, split, or sway back and forth; and there is no smoke visibly sinking or curling back down near the plate's edges.
level_5: Everything needed for a 4-point score holds, and in addition: the column's edges stay smooth and continuous rather than fraying into disconnected wisps or patches; its width increases at a smooth, gradual rate with height rather than in sudden jumps; and the smoke's density and opacity decrease gradually the higher up the column you look, consistent with dilution as it entrains and mixes with the surrounding air, while the column remains a single connected, centered body throughout its visible length.

Spatiotemporal Consistency rubric:
level_1: The plate or enclosure suddenly appears in a different spot or the enclosure's walls vanish and reappear between frames; the smoke column appears fully formed out of nowhere with no visible origin; the whole scene cuts between bright and dark lighting with no transition; or the plate or smoke blinks out of view for more than an instant.
level_2: Smaller breaks occur: the plate appears to clip through the floor of the enclosure; the point where smoke originates jumps sideways between frames; the enclosure's corners look bent or distorted; the shadow cast by the plate changes direction inconsistently; or the smoke column breaks into separate disconnected blobs with no visible motion connecting them.
level_3: The plate stays put on the enclosure's base, the smoke keeps originating from the same fixed spot above the plate, and the enclosure's walls stay rigid and properly aligned; the shadow the plate casts on the enclosure floor stays on the same side and doesn't change length or direction over the course of the clip, consistent with nothing in the shot moving the light.
level_4: The heat shimmer above the plate stays present and continuous rather than flickering in and out; the smoke column's outline stays coherent from frame to frame without breaking into disconnected speckles or suddenly jumping sideways; and since the camera never moves, the plate, smoke, and enclosure walls keep exactly the same spatial relationship to one another throughout.
level_5: Where the plate meets the enclosure's floor there is a clean line with no visible overlap between the two; the smoke column's centerline holds steady with no visible side-to-side wander over time; and the shot shows no lens flare, color fringing, or motion blur that would obscure the vertical plate-to-smoke relationship.