Domain: Natural Science — Physics
Target concept: Deformation of Thin-Walled Metallic Containers Caused by Pressure

Video generation prompt: A thin-walled metallic container is placed inside a transparent pressure chamber, and as the pump continuously removes air, the surrounding pressure gradually decreases.

Evaluation guide:
(i) Target concept: External atmospheric pressure causes inward buckling of a thin-walled metallic container when internal gas pressure is reduced below ambient.
Minimum mechanism: Chamber must be rigid and airtight; container must be thin-walled and metallic (not brittle or composite); pressure differential must be unidirectional (external > internal); deformation must result from compressive hoop stress, not impact or thermal stress.
(ii)Storyline: Frame 1: Static shot showing intact container centered inside sealed transparent chamber, pump connected but inactive. Frame 2–4: Pump connection confirmed (tubing intact, no leaks); container remains geometrically intact. Frame 5–8: Progressive inward deformation initiates at container sidewalls and propagates uniformly toward center; top/bottom lids remain planar but sink slightly. Frame 9–10: Deformation stabilizes in a fully collapsed but continuous buckled state; no rebound, no fragmentation. Perspective: Fixed frontal view, full container and chamber visible; no occlusion; lighting from fixed frontal source casting consistent shadows on deforming surface.

Manual:
Experimental Procedure
1. Place a thin-walled metallic container (e.g., empty aluminum soda can) upright inside a transparent rigid pressure chamber.
2. Seal chamber and connect vacuum pump tubing to chamber inlet valve.
3. Activate pump to gradually remove air from chamber.
Observation of Experimental Phenomena
The metallic container visibly and progressively collapses inward from all sides, maintaining structural integrity without rupture, while remaining upright and centered inside the chamber.
Summary of Experimental Principles
As air is removed from the chamber, external atmospheric pressure exceeds internal pressure; the thin walls cannot resist the net inward force, causing elastic-plastic buckling and volume reduction — demonstrating pressure differential effects on thin-walled structures.

Prompt Grounding rubric:
level_1: No transparent pressure chamber visible; no thin-walled metallic container present; no pump or vacuum tubing visible; no indication of air removal process; scene does not depict a controlled experimental setup.
level_2: Transparent pressure chamber is present but empty; or thin-walled metallic container is present but outside the chamber; or pump is visible but not connected to chamber; at least two core objects (chamber, container, pump) are missing or incorrectly positioned.
level_3: Transparent pressure chamber is present and contains a thin-walled metallic container; pump is visibly connected to chamber via tubing; all three core objects (chamber, container, pump/tubing) are present and spatially related as in a vacuum experiment; no action sequence shown (e.g., no visible change over time).
level_4: All three core objects present and correctly arranged: container fully inside chamber; tubing connects pump to chamber inlet; chamber is sealed; sequence shows container stationary at start, then visible deformation occurs later in the video; deformation appears only after pump connection is established and no earlier.
level_5: All three core objects present, correctly arranged, and functionally coherent: container is centered inside transparent chamber; tubing enters chamber through a sealed port; pump is operational (e.g., motor housing visible, subtle vibration or indicator light); deformation begins only after pump activation is implied by motion onset (e.g., first frame with deformation occurs strictly after at least one frame showing intact container + active pump connection).

Scientific and Causal Correctness rubric:
level_1: Container remains rigid and unchanged; or deforms outward/inward inconsistently with pressure drop; or changes color, melts, ruptures, or exhibits liquid-like flow; no causal link between pump operation and container shape.
level_2: Container deforms but in direction opposite to expected (e.g., bulges outward while pressure decreases); or deformation occurs before pump connection is visible; or container collapses asymmetrically without physical justification (e.g., buckling on one side only with no support asymmetry); or deformation persists after pump stops (if stop is implied).
level_3: Container deforms inward (implies collapse due to external atmospheric pressure exceeding internal pressure); deformation is continuous and progressive over time; no phase reversal (e.g., no rebound or oscillation); deformation is global (affects entire body), not localized to seams or edges only.
level_4: Inward deformation is global and monotonic; container retains metallic appearance (no gloss loss, no transparency change, no discoloration); no rupture, perforation, or permanent creasing during deformation; deformation magnitude increases steadily from start to end without discontinuous jumps or pauses in progression.
level_5: Inward deformation is global, monotonic, and strictly proportional to visual cues of pump activity (e.g., deformation accelerates only when tubing shows airflow indication or pump housing vibrates); container maintains uniform surface texture and specular reflectivity throughout; no structural failure, no detachment of parts, no shadow inconsistency indicating phantom geometry; deformation ceases immediately if pump disconnect is shown.

Spatiotemporal Consistency rubric:
level_1: The container appears to jump instantly between two different positions in frame with no motion shown in between; the chamber blinks out of the shot and back a moment later; an unexplained, instantaneous lighting or background change occurs; the container flickers or splits into disconnected pieces; motion blur is severe enough that the container's shape cannot be made out across several consecutive frames.
level_2: The container shifts to a different spot in the frame between shots with no visible path connecting the two positions; the chamber's edges appear to warp or bend in a way rigid glass or plastic could not; the lighting changes abruptly partway through with no occlusion or moving light source to explain it; the deformation appears fully formed in one frame with no visible in-between shape leading up to it.
level_3: The container stays in the same place relative to the chamber's interior; the chamber walls keep a straight, rigid appearance throughout; the bright highlight on the container's curved surface shifts gradually and stays a single continuous streak as the surface curves inward, rather than jumping to a new spot; the deformation passes through at least a few visibly different in-between shapes (e.g., intact -> a slight inward dent -> a more pronounced flattening) rather than jumping straight from intact to fully deformed; the container never appears to poke through the chamber wall.
level_4: The container's only visible motion is its own surface deforming inward: no sideways drift, rotation, or bouncing of the whole object; the camera viewpoint and framing stay fixed; the reflected highlight on the denting surface narrows and moves smoothly in step with the growing curvature, never splitting into a second highlight or vanishing outright; the deformation unfolds smoothly across frames with no jump-looking skip or repeated identical frame.
level_5: There is no visible drift in the container's position relative to the chamber; the chamber's corners and edges stay sharply defined throughout; the lighting and shading on the container's surface change smoothly and believably as its shape dents inward; every visible stage of the deformation looks like a physically plausible in-between shape, with none that looks pasted in or morphed abruptly from the last one.