Domain: Engineering — Materials Science & Engineering
Target concept: Visualization of Thermal Conductivity Comparison of Construction Materials

Video generation prompt: Three large samples—rock wool (pale yellow), steel (silver gray), and wood (brown)—are displayed side by side, with dynamic red heat flow arrows indicating the rate of heat transfer. The focus of the image is on the contrasting movement speeds of the red arrows on the three samples.

Evaluation guide:
(i) Target concept: Visual encoding of relative thermal conductivity via kinematic proxy (arrow speed). Minimum mechanism: Arrow speed must be a monotonic, perceptually resolvable proxy for material-specific k-value; viewer must infer conductivity ranking solely from comparative motion: no labels, numbers, or narration required.
(ii)Storyline: Frame 1: Static side-by-side display of three correctly colored material samples. Frame 2–10: Simultaneous onset of red arrows on all three, moving unidirectionally. Causal transition 1: Material identity → arrow speed assignment (steel→fastest, wood→intermediate, rock wool→slowest). Causal transition 2: Arrow speed difference → sustained visual contrast in displacement over time. Perspective constraint: Fixed frontal orthographic viewpoint, no camera motion, no occlusion, no depth layering: all samples and arrows fully visible and co-planar. Visibility constraint: Arrows must remain fully legible (color, shape, motion) against their respective material backgrounds throughout.

Manual:
Experimental Procedure
1. Place three large rectangular samples — rock wool (pale yellow), steel (silver gray), and wood (brown) — side by side in a fixed frontal view.
2. Overlay dynamic red heat flow arrows on each sample, oriented identically (e.g., left-to-right), starting simultaneously.
3. Animate arrows to move continuously at speeds reflecting thermal conductivity: steel (fastest), wood (intermediate), rock wool (slowest).
Observation of Experimental Phenomena
Red arrows move continuously on all three samples; steel's arrow advances visibly farther than wood's arrow within the same visual duration; wood's arrow advances farther than rock wool's arrow, so wood is clearly slower than steel but faster than rock wool — creating unambiguous relative speed contrast across all three samples.
Summary of Experimental Principles
Thermal conductivity (k) determines rate of conductive heat transfer: steel (k ≈ 50 W/m·K) > wood (k ≈ 0.1–0.2 W/m·K) > rock wool (k ≈ 0.03–0.04 W/m·K); thus, higher-k materials permit faster apparent heat propagation, visualized as faster-moving arrows.

Prompt Grounding rubric:
level_1: Fewer than three side-by-side material samples are shown; or none of rock wool (pale yellow), steel (silver gray), or wood (brown) appears in its correct color; or no red heat-flow arrows are present on any sample.
level_2: Exactly three material samples are present and arranged side-by-side, but at least one has the wrong color (e.g., steel shown blue, wood shown black, rock wool shown white); or red arrows appear but are not placed on the material samples; or arrows appear on only one or two of the three samples.
level_3: Three side-by-side material samples are present with correct colors (rock wool pale yellow, steel silver gray, wood brown); red heat-flow arrows appear on all three materials; however, the arrows' movement looks identical across all three samples with no visible difference in speed.
level_4: All three materials are present with correct colors and a side-by-side arrangement; red arrows appear on all three and move continuously; at least two of the three arrows show a clearly visible difference in speed from each other, but not all three speeds are mutually distinguishable (e.g., two of the three arrows move at a visually indistinguishable pace).
level_5: All three materials are present with correct colors (rock wool pale yellow, steel silver gray, wood brown), arranged strictly side-by-side in a fixed viewpoint; red heat-flow arrows appear on all three and move continuously; all three arrows show three mutually and clearly distinguishable speeds (no two of the three move at a visually indistinguishable pace), regardless of which material's arrow is fastest or slowest (the correctness of the specific ranking is scored separately, under scc_specification).

Scientific and Causal Correctness rubric:
level_1: There is no visible link between a material's identity and its arrow's speed; or the arrow-speed ranking contradicts the thermal-conductivity hierarchy in an extreme way (e.g., the rock wool or wood arrow moves faster than the steel arrow); or an arrow moves backward, pulses, or vanishes and reappears without a continuous path; or a material's color contradicts its real-world appearance (e.g., steel rendered as yellow, wood rendered as metallic).
level_2: Arrows move on all three materials but the speed ranking is fully inverted (e.g., wood or rock wool visibly fastest, steel visibly slowest); or at least one material's color is physically implausible for its class (e.g., rock wool shown as glossy black, steel shown as translucent); or an arrow's motion is discontinuous: it jumps, freezes noticeably, or restarts from its origin repeatedly.
level_3: Materials have correct colors and a side-by-side layout; arrows move continuously on all three; visible speed differences exist among the arrows, but the ranking is only partially correct; for example, the steel arrow is unambiguously the fastest, but the rock wool and wood arrows move at visually indistinguishable speeds so it cannot be confirmed that rock wool is the slowest and wood is in between; or the steel arrow is not clearly the fastest of the three.
level_4: All materials are correctly colored and positioned; arrows move continuously and at different speeds; the steel arrow is unambiguously the fastest of the three; the rock wool arrow is unambiguously the slowest of the three; but the wood arrow's speed is not clearly distinguishable from the rock wool arrow's (they appear nearly equal, with no clearly perceptible gap), or the arrows show a slight wobble/lateral drift that undermines a clean straight-line flow reading.
level_5: The steel arrow moves continuously, smoothly, and is unambiguously the fastest of the three; the rock wool arrow moves continuously, smoothly, and is unambiguously the slowest of the three; the wood arrow moves continuously, smoothly, and at a clearly intermediate speed (slower than steel, faster than rock wool) with no hesitation, reversal, branching, or unexplained change in speed; all three arrows travel in the same direction (e.g., consistently left-to-right) across their samples; no material's color, shape, or arrow timing contradicts the expected steel > wood > rock wool conductivity ordering.

Spatiotemporal Consistency rubric:
level_1: One or more of the three material samples instantly jumps to a new position or vanishes and reappears elsewhere between consecutive frames; a sample's position or orientation changes abruptly mid-video; the apparent lighting swings violently (e.g., full shadow to full highlight within a single frame); or a sample's structural integrity breaks (the wood visibly fractures, the steel appears to melt, or the rock wool flows like a liquid).
level_2: At least one material sample noticeably changes size or aspect ratio during the video; an arrow's start or end point shifts sideways between frames without any corresponding travel (a jitter rather than motion); the background flickers or warps; the apparent light source shifts, causing the three samples' cast shadows to point in different, inconsistent directions across frames; or the camera appears to zoom, pan, or rotate.
level_3: All three materials stay fixed in position, size, and orientation; each arrow starts and ends at the same relative spot on its own sample (e.g., always entering at the left edge and exiting at the right); the apparent light source stays in the same place throughout, so each sample's cast shadow keeps the same length and angle from the first frame to the last; there is no tearing, warping, or misalignment between frames, though the arrows' motion may show an occasional minor stutter that doesn't break the overall sense of continuous travel.
level_4: All spatial relationships are preserved: the side-by-side arrangement stays rigid, with no sample shifting, resizing, or rotating; each arrow keeps a consistent attachment point on its material; each sample's shadow keeps the same length and angle throughout, with no sudden brightening or dimming; the arrows' motion reads as smooth and continuous, with at most one arrow showing a minor visual inconsistency (e.g., a brief thickness change or a faint trailing streak) that doesn't change which arrow it is or where it's headed.
level_5: There is no spatial or temporal discontinuity at all: all three materials stay static in position, size, and orientation, and each sample's lighting and the shadow it casts look identical to how they appeared in frame one; each arrow moves with smooth, uniform thickness and a consistent head/tail shape, always attached at the same point on its material; there is no flicker, jitter, warping, stretching, or apparent depth shift; every frame flows naturally into the next with no visible jump, freeze, or repeated frame.