Domain: Natural Science — Physics
Target concept: Thermal Diffusion on a Metal Plate Visualized by Infrared Imaging

Video generation prompt: Viewed from above, the thermal imaging camera observed a flat metal plate: a small heating element briefly touched near its center and then was removed, but the recording continued.

Evaluation guide:
(i) Target concept: Transient conductive heat diffusion in a homogeneous solid under localized, brief thermal excitation, visualized via surface temperature mapping.
Minimum mechanism: Metal must behave as a thermally conductive continuum (not insulator or phase-changing material); heating element must deliver finite, localized energy; infrared camera must map temperature monotonically to visual intensity/color; no external convection or radiation dominates conduction.
(ii)Storyline: [Frame 0–t1] Flat metal plate fills overhead view, thermally uniform (cool baseline). [t1–t2] Small heating element enters vertically from above, contacts center with clean interface. [t2–t3] Compact warm spot appears exclusively at contact point, peak intensity stable. [t3–t4] Element fully retracts and exits frame; warm spot begins immediate intensity decay at center. [t4–t5+] Simultaneous radial expansion of warm zone begins from center, progressing smoothly and symmetrically outward while central intensity continues decreasing; all under fixed overhead view and consistent thermal visualization.

Manual:
Experimental Procedure
1. Place a flat, uniform metal plate horizontally on stable surface.
2. Position thermal imaging camera directly overhead, fixed and focused on plate center.
3. Briefly touch a small heating element to the geometric center of the plate, then fully remove it.
4. Continue recording for several seconds after removal.
Observation of Experimental Phenomena
A localized warm region appears at the contact point during touch; after removal, the warm region decays at the center while simultaneously spreading outward in a symmetric, continuous radial gradient across the plate surface.
Summary of Experimental Principles
Thermal energy diffuses through the metal via conduction; the rate and pattern depend on material conductivity, thickness, and boundary conditions; infrared imaging visualizes surface temperature distribution, revealing the transient diffusion process.

Prompt Grounding rubric:
level_1: No metal plate visible; no heating element present; no overhead viewpoint; no sequence showing contact-then-removal; no thermal imaging visual style (e.g., grayscale or false-color heat map absent or replaced by RGB photography)
level_2: Metal plate is present and flat, and viewpoint is overhead, but heating element is missing OR never contacts the plate OR remains in contact throughout; thermal imaging visual style is partially present (e.g., color gradient exists but lacks center-localized origin or violates false-color convention for heat)
level_3: Metal plate is flat and viewed from directly above; a small heating element appears, makes contact near the center of the plate, and then fully disappears from frame; thermal imaging visual style is present (false-color or grayscale intensity map); however, the contact location is not centered, or the heating element is misshapen (e.g., large, irregular, or non-point-like), or the removal occurs before any visible thermal response emerges
level_4: All prompt elements are present and correctly ordered: (1) flat metal plate, (2) overhead fixed viewpoint, (3) small heating element appears, (4) contacts plate near the exact center, (5) element fully withdraws from the plate surface and leaves the frame, (6) thermal imaging visual style applied consistently; only non-core flaws exist, e.g., a slight jitter in the overhead viewpoint, the heating element's outline looking slightly soft or blurred at its edges, or a brief flash during removal that does not quite match how a thermal camera would render the scene.
level_5: All prompt elements are present, correctly ordered, and visually unambiguous: flat metal plate occupies full field-of-view under stable overhead view; small, distinct, point-like heating element enters frame, contacts plate at geometric center with clean spatial alignment, remains in contact for a discernible duration (no instantaneous flash), fully retracts and exits frame without lingering; thermal imaging visual style is continuous, internally consistent (e.g., warmest region appears only at contact point and spreads radially post-removal), and maintains false-color or grayscale mapping throughout without mode switching or artifact

Scientific and Causal Correctness rubric:
level_1: No thermal diffusion visible; plate shows uniform temperature (no gradient); heating element contact produces no localized warming; no radial spread after removal; color pattern contradicts physics (e.g., cooling colors appear where heating occurred)
level_2: Localized warming appears at contact point, but color does not follow thermal imaging convention (e.g., blue = hot, red = cold); warming persists identically after removal (no decay/spread); no radial propagation outward; warming appears at edge or multiple random locations unrelated to contact
level_3: Localized warming appears at contact point with correct thermal color mapping (e.g., white/yellow/red = warm, black/blue = cool); warming begins during contact and continues after removal; radial spread initiates from contact point; but spread is non-uniform (e.g., only leftward, asymmetric, or discontinuous); no visible decay of peak intensity over time post-removal
level_4: Warming appears only at contact point during contact, with correct thermal color mapping; after removal, warming decays gradually at the center while simultaneously spreading radially outward in all directions as a continuous, symmetric gradient; no extraneous warming elsewhere; all state changes obey action→result causality (contact → local warming → post-contact spread + decay); only non-core flaws exist, e.g., slight delay between removal and onset of spread, or minor pixelation obscuring smooth gradient
level_5: During contact: single, compact warm region appears exclusively at geometric center, with sharp thermal boundary and correct false-color mapping; immediately upon removal: central region begins monotonic intensity decay AND simultaneous smooth, symmetric radial expansion of warmer zone into adjacent regions; expansion is continuous (no jumps or skips), fills progressively larger concentric zones, and maintains thermal color hierarchy (hottest at center, cooler outward); zero spurious warming, zero symmetry breaks, zero reversal or inversion of gradient direction

Spatiotemporal Consistency rubric:
level_1: The metal plate visibly jumps to a new position, warps, or changes size between frames; the heating element appears or disappears with no visible motion connecting it to its contact with the plate; the lighting or shadow pattern on the plate changes abruptly with no visible cause; the warm region on the plate vanishes and then reappears in a different location; an object that should be behind another, such as the heating element relative to the plate's edge, appears in front of it inconsistently.
level_2: The plate stays in place but the overhead view wobbles or distorts as though the camera were unsteady; the heating element appears or disappears instantly rather than approaching and retracting along a visible path; the warm region on the plate appears or disappears abruptly rather than fading in or out; the shadow or reflection pattern does not match a light source coming from directly overhead.
level_3: The metal plate stays rigid and in the same place throughout; the heating element approaches from above, touches the plate, and lifts away again along a physically believable path; the warm patch the camera shows changes smoothly from one moment to the next with no jump in its position; the lighting and shadows on the plate look the same from the overhead view throughout; the only flaw is a very subtle, brief wobble in the plate or camera view that does not affect how the temperature pattern reads, or an unrelated brief flicker in overall brightness that has nothing to do with the heating event.
level_4: The plate never shifts, rotates, or changes size; the heating element moves smoothly along a single vertical path, slowing as it approaches contact and as it lifts away; the warm region spreads outward as one continuous, gapless glow rather than in visible steps; the lighting, reflections, and shadows on the plate stay stable and match a fixed overhead light source throughout; the only flaw is a faint shimmer along the moving heating element, or the edge of the expanding warm region looking momentarily slightly rough rather than perfectly smooth.
level_5: The plate never visibly shifts, rotates, or changes size across the entire video; the heating element's approach, contact, and withdrawal form one smooth, continuous motion with no visible skipping or sudden change in speed; the warm region expands from the center as a perfectly seamless, evenly spreading glow in all directions with no gaps or steps; the lighting, contrast, and shadow pattern on the plate stay exactly the same throughout; there is no flicker in overall brightness, no blurring during the heating element's motion, and no shift in how the plate's edges align with the frame.