Domain: Natural Science — Physics
Target concept: Thermal Insulation Test: Comparison of Ice Melting on Ceramic Tiles and Metal Plates

Video generation prompt: Place a ceramic tile on the left side of the table, and a similar metal plate on the right side. Place ice cubes of the same size at the center of each, and record under the same indoor conditions.

Evaluation guide:
(i) Target concept: Thermal conductivity governs differential melting rates of identical ice cubes on materials with contrasting heat transfer properties.
Minimum mechanism: Metal must be thermally conductive enough to extract heat from surroundings and deliver it to ice faster than ceramic; ice must undergo solid→liquid phase change with visible macroscopic indicators (edge rounding, pooling); ambient temperature must exceed 0°C to permit melting; no external heating/cooling applied.
(ii)Storyline: Frame 1–2: Static wide shot showing ceramic tile (left), metal plate (right), and two identical intact ice cubes centered on each. Frame 3–6: Ice on metal plate begins showing edge softening and small liquid pool forming beneath base; ice on ceramic remains geometrically rigid with sharp corners and no liquid. Frame 7–10: Liquid pool on metal grows cohesively and reflects light; ceramic-side ice retains full opacity, angular silhouette, and dry surface. Perspective: Fixed frontal view, eye-level, full setup always in frame; no occlusion; lighting uniform and static to avoid confounding visual cues.

Manual:
Experimental Procedure
1. Place a ceramic tile on the left side of a flat table surface.
2. Place a metal plate of similar size and shape on the right side of the same table.
3. Place one ice cube of identical size and shape at the exact center of the ceramic tile.
4. Place another identical ice cube at the exact center of the metal plate.
5. Record continuously under stable indoor lighting with fixed frontal viewpoint.
Observation of Experimental Phenomena
Ice on the metal plate develops visible liquid water pooling and rounded edges; ice on the ceramic tile remains angular and solid with no pooling or visible liquid.
Summary of Experimental Principles
Metals conduct heat more efficiently than ceramics. Under identical ambient conditions, heat transfers faster from the table and air into the ice on the metal plate, accelerating melting. Ceramic’s low thermal conductivity slows heat transfer, preserving the ice longer.

Prompt Grounding rubric:
level_1: No ceramic tile and no metal plate visible; or only one of the two surfaces appears; or ice cubes are absent from one or both surfaces; or the surfaces are not resting on a table; or the ceramic tile is not on the left / metal plate is not on the right relative to the camera.
level_2: Both the ceramic tile and metal plate are present on the table, but their left/right placement is swapped (ceramic on the right, metal on the left) or unclear; or an ice cube is present but not centered on its surface; or the tabletop itself is not clearly visible.
level_3: The ceramic tile sits on the left half of the table and the metal plate sits on the right half, both lying flat and stationary; one ice cube rests at the center of the ceramic tile and a second, matching ice cube rests at the center of the metal plate; both surfaces, both ice cubes, and the table are visible together in one continuous shot from a fixed viewpoint.
level_4: Everything required for score 3 holds, and in addition the two ice cubes match each other in size, shape, and opacity (no cube looks visibly larger, chipped, or cloudier than the other); the ceramic tile reads as a matte, light-colored surface and the metal plate reads as a smooth, reflective gray surface, so the two materials are never confused; and no extra object (hand, tool, label) blocks the view of either surface.
level_5: Everything required for score 4 holds, and in addition both ice cubes are shown fully solid and undripped in the opening frames (no pooling, softened edges, or shrinkage visible yet at that point); the ceramic tile and the metal plate occupy similar amounts of screen area (neither is zoomed in or cropped so it looks smaller than the other); and the camera holds a level, untilted frontal angle throughout so left and right are never ambiguous.

Scientific and Causal Correctness rubric:
level_1: Neither ice cube shows any visible softening, pooling, or shrinkage during the whole video (both stay fully solid and dry); or both ice cubes develop pooling/edge-rounding at the same visible rate with no difference between them; or an ice cube shrinks, cracks, or disappears without any liquid ever appearing beneath it.
level_2: A visible difference in melting appears, but in the scientifically wrong direction: the ice cube on the ceramic tile develops rounded edges or a liquid puddle while the ice cube on the metal plate stays sharp-edged, opaque, and dry, which is the reverse of what thermal conductivity predicts.
level_3: The ice cube on the metal plate develops a visible liquid puddle beneath it and/or rounded, softened edges, while the ice cube on the ceramic tile stays angular, opaque, and dry; this metal-melts-first contrast is visible across several consecutive frames, not just a single instant.
level_4: Everything required for score 3 holds, and in addition the puddle under the metal-plate ice stays on the metal plate itself rather than spreading onto the table; the ceramic-side ice keeps sharp corners and even opacity with no localized wet-looking patches; and no frost or condensation appears on the metal plate that could be mistaken for melt water.
level_5: Everything required for score 4 holds, and in addition the puddle on the metal plate looks like a coherent, light-reflecting liquid rather than a dull damp patch; the ceramic-side ice shows no softening, no droplet formation, and no blurred contour at any point in the video; and the metal-melts-first contrast, once it begins, stays visible continuously through to the end of the video rather than appearing and then vanishing.

Spatiotemporal Consistency rubric:
level_1: The ceramic tile, metal plate, or an ice cube jumps to a different spot or vanishes and reappears; the tabletop suddenly changes texture or position; the shadow beneath the tile or plate swaps to the opposite side of its object or blinks out and back in with no lighting or camera change to explain it; or the shot cuts or pans to a new angle.
level_2: The setup stays in frame but moves in physically odd ways: an ice cube slides or trembles for no reason; the metal plate shakes while the ceramic tile stays perfectly still (or vice versa); the tabletop bends or ripples; or the shadow cast by the tile or plate swings to a different angle from one frame to the next without any light source moving.
level_3: The ceramic tile, metal plate, table, and both ice cubes stay fixed in place for the whole video: nothing slides, rotates, or warps; the light source doesn't move, so neither the tile's nor the plate's shadow swings to a new direction or changes sharpness partway through; the background shows no flicker or distortion; and the camera holds one framing with no zoom, pan, tilt, or refocus.
level_4: Everything required for score 3 holds, and in addition the edges of the tile, plate, and ice cubes stay crisp from frame to frame with no flicker or edge-crawling; any liquid forming on the metal plate spreads smoothly with no strobing or ghost outlines; and the shadow shapes stay matched to a single, unmoving light source throughout.
level_5: Everything required for score 4 holds, and in addition there is no visible shaking, trembling, or vibration of the ice cubes or the plates at any point; the reflective sheen on the metal plate changes smoothly rather than flickering; and once liquid appears on the metal plate, it spreads as one continuous surface rather than breaking into disconnected patches between frames.