Domain: Engineering — Materials Science & Engineering
Target concept: The pressure chamber compresses the foam cup (simulating deep-sea pressure)

Video generation prompt: A white foam cup is placed inside a transparent, water-filled pressure vessel. The vessel lid is moved into place and sealed; only after the lid is fully sealed does the internal pressure begin to increase.

Evaluation guide:
(i) Target concept: Hydrostatic compression of porous solid (foam) in an incompressible fluid medium.
Minimum mechanism: Vessel must be rigid and sealed; water must be present and immobile to transmit pressure isotropically; foam cup must retain structural integrity while undergoing reversible (in video timeframe) volumetric reduction due to air expulsion from pores.
(ii)Storyline: Frame 1–2: Static shot showing white foam cup centered inside transparent vessel filled with still water. Frame 3–4: Lid approaches vessel opening and makes full contact. Frame 5–6: No change until lid contact is complete. Frame 7–10: Cup begins and continues monotonic, symmetric shrinkage (height and width decrease proportionally, maintaining cylindrical symmetry and full submersion) with no water displacement, no cup rotation, and no vessel deformation. Viewpoint is fixed frontal, orthographic-leaning (no perspective distortion), ensuring all key objects remain fully in-frame and unoccluded.

Manual:
Experimental Procedure
1. Place a white foam cup inside a transparent, water-filled pressure vessel.
2. Seal the vessel by closing its lid completely.
3. Gradually increase internal pressure (visually implied by cup compression).
Observation of Experimental Phenomena
The white foam cup uniformly shrinks in height and diameter while remaining intact, fully submerged, and centered inside the transparent vessel; water remains still and fully surrounding the cup; no leakage, rupture, or discoloration occurs.
Summary of Experimental Principles
Foam is a compressible porous solid; under hydrostatic pressure in a confined, fluid-filled environment, air pockets collapse, reducing overall volume — demonstrating material response to deep-sea-equivalent stress.

Prompt Grounding rubric:
level_1: No white foam cup is visible; or no transparent vessel is shown; or the vessel contains no visible water; or the vessel is never shown together with a lid at all.
level_2: The white foam cup, the vessel, and water are all present, but at least one is set up wrong: the cup is not placed inside the vessel (sits beside or outside it), the vessel is opaque rather than transparent, the vessel appears empty of water, or no lid is ever shown approaching the vessel opening.
level_3: The white foam cup sits inside the transparent, water-filled vessel from the start; a lid is shown moving toward the vessel opening, but it never reaches full contact/seal, or its approach is a single instant jump rather than a visible motion toward the opening.
level_4: The cup is centered inside the transparent, water-filled vessel; the lid visibly travels to the vessel opening and makes full contact, closing the vessel; the cup, vessel, and water are correctly sized, colored, and positioned relative to one another with no missing or duplicated objects.
level_5: The score 4 setup holds, and the camera keeps a fixed, frontal framing that keeps the cup, vessel walls, water, and lid fully visible and unoccluded from the first frame to the last, with no extraneous props or mislabeled parts anywhere in the scene.

Scientific and Causal Correctness rubric:
level_1: The foam cup shows no size change at all after the lid seals; or the cup changes color, melts, dissolves, or disappears instead of compressing; or the cup begins compressing before the lid makes contact with the vessel, or while no lid is present at all.
level_2: The cup changes shape in a way inconsistent with hydrostatic compression: it expands instead of shrinking, cracks or fragments, appears to turn to liquid, or its outline changes while its apparent volume stays the same; or the water level rises/falls dramatically, or the vessel visibly bulges.
level_3: After the lid is fully sealed, the cup visibly shrinks in height and width; however the shrinking looks instantaneous (e.g., a cut from full size to half size in one frame) rather than gradual, or the cup starts shrinking while the lid is still approaching rather than after it is sealed, or part of the cup appears to exit the water/vessel during the shrinking.
level_4: The cup's shrinkage begins only after the lid is fully sealed, proceeds as a continuous, one-directional reduction in size (no pausing partway, no bouncing back, no re-expanding), and stays confined to the cup itself: the water does not spill out and the vessel walls do not flex.
level_5: The score 4 behavior holds, and the shrinking looks smooth and roughly symmetric (no sudden flattening on one side or lopsided collapse); the cup keeps its matte white foam appearance without turning glassy or translucent; the water stays clear and undisturbed, with no ripple or meniscus break tied to the compression.

Spatiotemporal Consistency rubric:
level_1: The cup, vessel, or lid abruptly appears, disappears, or jumps to a new position between frames; the scene cuts away and back without a smooth transition; the cup's shrinking direction suddenly reverses with no explanation; the room lighting changes drastically with no visible source.
level_2: The cup appears to float free of the water instead of staying submerged; a shadow or reflection stays fixed even though the lid clearly moves; the vessel's cross-section visibly warps (e.g., circular becomes oval) with no camera-angle change to justify it; the cup shifts sideways with no lid contact or force applied to it.
level_3: The cup, vessel, and lid all stay in the same relative positions throughout, with no swapping places or vanishing; the lid's closing motion is shown as continuous travel, not a jump cut; the water surface may show at most a faint, uniform ripple that doesn't break the sense of a still, undisturbed vessel.
level_4: The score 3 continuity holds, and the lid's motion toward the vessel is smooth and aimed straight at the opening; the cup stays centered and fully visible inside the vessel at every frame; the vessel walls keep sharp, steady edges with no flicker or warping; there is no visible shake or drift in the cup's position.
level_5: The score 4 continuity holds, and the cup, water surface, and vessel wall keep a physically consistent depth relationship (the cup is clearly seen through the near vessel wall, fully surrounded by water) across every frame; there is no strobing or tearing-like artifact in the water or vessel surfaces; the motion of lid, cup, and water stays smooth with no visible stutter.