Domain: Natural Science — Physics
Target concept: A heated metal wire immersed in room-temperature water exhibits surface bubble nucleation...

Video generation prompt: A thin metal wire is horizontally stretched and placed in a transparent glass container filled with water at room temperature, and is electrically heated by an external power source.

Evaluation guide:
(i) Target concept: Heterogeneous nucleation of vapor bubbles at a solid–liquid interface under localized resistive heating.
Minimum mechanism: Wire must be electrically conductive, solid, and in direct contact with sub-boiling liquid water; heating must be sufficient to create transient superheat at interface but insufficient to cause bulk phase change or wire oxidation/melting; water must remain liquid-phase and optically transparent to permit observation.
(ii)Storyline: [Phase 1: Static Setup] Container with still water and motionless horizontal wire fully immersed; baseline state. [Phase 2: Heating Initiation] Leads energized → wire begins heating; for a brief initial interval only resistive warming occurs, with no bubbles yet visible (an invisible warm-up period before nucleation starts). [Phase 3: Nucleation Onset] Once the wire surface locally reaches the superheat threshold, bubbles begin appearing at multiple points distributed along the wire's length, not confined to the two end connections only. [Phase 4: Growth & Detachment] Bubbles expand radially from wire, maintain spherical cap shape while attached, then detach cleanly and rise vertically. [Phase 5: Sustained Process] Continuous nucleation-growth-detach cycle persists while power is applied; cessation occurs immediately upon power-off: no residual bubbling. Perspective: Fixed frontal view showing full wire length, water column depth, and container geometry; no occlusion; lighting enables clear contrast between wire, bubbles, and water.

Manual:
Experimental Procedure
1. Place a transparent glass container on stable surface.
2. Fill container with clear water to submerge wire completely.
3. Horizontally stretch a thin bare metal wire across container interior, securing endpoints to opposite walls.
4. Connect wire endpoints to external DC power supply via insulated leads.
5. Activate power supply to heat wire resistively.
Observation of Experimental Phenomena
Bubbles nucleate exclusively along the immersed wire surface, grow steadily, detach, and rise vertically through water — no boiling, no steam, no wire discoloration.
Summary of Experimental Principles
Resistive heating raises wire temperature above local saturation point, triggering heterogeneous nucleation of vapor bubbles at wire–water interface — governed by surface energy, thermal conductivity, and superheat limit below bulk boiling.

Prompt Grounding rubric:
level_1: No transparent glass container visible; no thin metal wire present; no water visible; no electrical heating apparatus (e.g., wires, power supply terminals) shown; none of the core objects or setup steps from the posted_prompt appear.
level_2: At least one core object present (e.g., glass container OR water OR metal wire), but at least two of: container not transparent, wire not thin, wire not horizontally stretched, water not visibly filling container, no evidence of external power connection (e.g., no attached leads or terminals).
level_3: Transparent glass container visible and filled with liquid; thin metal wire visibly present and horizontally oriented inside container; water level clearly above wire; at least two electrical connection points (e.g., wire ends attached to leads or terminals) are visible; all objects match type, quantity, and spatial arrangement in posted_prompt.
level_4: All elements from 3-score satisfied AND wire is fully immersed (no part protruding above water surface); container walls show no occlusion of wire or bubble region; electrical leads enter container only at wire endpoints (not mid-span or side-mounted); no extraneous objects (e.g., thermometers, stirrers, labels) interfering with core setup.
level_5: All elements from 4-score satisfied AND wire appears uniformly thin along entire length (no tapering or thickening); container is upright rectangular prism or cylinder with vertical sidewalls and flat base; water surface is still and horizontal; leads are visibly insulated and terminate cleanly at wire endpoints without kinks, splices, or junction boxes in frame.

Scientific and Causal Correctness rubric:
level_1: No bubble formation observed at any time; wire shows no thermal change (e.g., no glow, no shimmer, no distortion); water remains motionless and uniform; no causal link between heating and any visual effect is present.
level_2: Bubbles appear but only at non-wire locations (e.g., container bottom, walls, surface); or bubbles appear only after wire is removed; or wire changes color (e.g., red-hot) before bubbles form, violating causal order and physical plausibility for room-temperature nucleation.
level_3: Bubbles appear exclusively along the length of the heated wire; bubble formation begins during heating phase (not before or after); bubbles detach and rise upward; wire remains solid-colored (no incandescence or melting); water remains liquid and transparent; all phenomena consistent with nucleation at solid–liquid interface under resistive heating.
level_4: All elements from 3-score satisfied AND bubbles originate only at wire surface (no detachment from submerged leads or endpoints); bubble size distribution is heterogeneous (some small, some coalesced) but all remain attached until rising; no sustained steam, vapor cloud, or boiling layer, confirming sub-boiling nucleation; no color shift in water or wire.
level_5: All elements from 4-score satisfied AND bubbles initiate simultaneously across >80% of wire length within first visible heating interval; rising bubbles follow near-vertical trajectories without lateral drift; no bubble collapse or reattachment after detachment; no localized water turbidity, film, or residue at wire surface before/during/after bubbling.

Spatiotemporal Consistency rubric:
level_1: The wire's position or the container's shape/size changes abruptly between one frame and the next (e.g., the wire suddenly appears in a different location, or the container walls warp, stretch, or resize); the water surface flips between flat and sharply tilted with no cause; the lighting flashes abruptly between bright and dark within the shot, as if a light source (e.g., a spotlight) appeared or disappeared with no explanation; the wire disappears for one or more frames and then reappears; the number of active bubble-nucleation sites along the wire changes erratically frame to frame with no growth stage in between.
level_2: The wire drifts, shakes, or jumps by more than its own width between consecutive frames instead of staying put; bubbles appear already full-sized with no preceding growth stage, or vanish mid-rise instead of reaching the surface; the water level or meniscus shifts inconsistently with where bubbles are breaking the surface; shadows cast by the wire or container swing to a different direction with no corresponding change in a light source; a visible cut or splice makes the wire's position or orientation jump partway through the clip.
level_3: The wire stays fixed in position and orientation for the whole sequence; the container keeps a rigid, unchanging shape and placement; each bubble grows gradually from the wire surface before detaching and rising, rather than popping into existence or vanishing; the water surface stays level and undisturbed except where pierced by rising bubbles; the leads remain attached to the same two points on the wire throughout.
level_4: All elements from 3-score satisfied AND there is no parallax shift between the wire, water surface, and container walls across frames; bubble rise trajectories do not suddenly jump sideways or reverse direction; no bubble detaches before it has visibly grown, and none stays attached far longer than the growth-to-detachment pattern shown by other bubbles in the clip; the wire shows no visible cracking, fragmenting, or splitting apart.
level_5: All elements from 4-score satisfied AND the wire remains visually still at both ends throughout, with no perceptible drifting or shaking; bubble rise paths stay close to vertical rather than veering randomly; the water surface at the container wall stays continuously intact with no sudden breaks or gaps; the sequence plays with no visible stutter, repeated frames, or dropped-frame skips affecting the wire, bubbles, or water.