Domain: Natural Science — Marine Science
Target concept: Rotating tank model demonstrating the Coriolis deflection effect using dyed water

Video generation prompt: A transparent cylindrical tank is placed on a uniformly rotating turntable, and a bright dye is released from a fixed point near the central surface as the turntable continues to rotate.

Evaluation guide:
(i) Target concept: Coriolis deflection as an inertial effect in rotating frames, manifesting as persistent lateral curvature of a moving tracer in homogeneous fluid.
Minimum mechanism: Rotation must be sustained and uniform during dye motion; fluid must be quiescent prior to release; dye must be neutrally buoyant and non-diffusing rapidly; no external forces (e.g., stirring, gravity gradients, boundary friction dominance) may override the rotational frame effect.
(ii)Storyline: [Phase 1] Stable rotating system established: tank + water visible, turntable rotating uniformly, no dye present. [Phase 2] Dye released from fixed point near central surface: origin point clearly anchored, no motion before release. [Phase 3] Dye begins outward motion while maintaining fixed spatial relationship to tank center: initial radial segment visible. [Phase 4] Curvature initiates and progresses continuously: trajectory deviates monotonically from radial line, direction consistent with rotation sense. [Phase 5] Full deflected arc visible: dye remains a coherent, bright, curving streak with no splitting, fading, or straightening; all phases occur within single fixed viewpoint with no cuts or re-framing.

Manual:
Experimental Procedure
1. Place a transparent cylindrical tank centered on a motorized turntable.
2. Fill tank with clear water to 80% height.
3. Start uniform rotation of turntable until steady state is reached.
4. Release a small volume of bright dye (e.g., fluorescein) from a fixed pipette positioned just above the water surface near the tank center.
Observation of Experimental Phenomena
The dye does not spread radially outward; instead, it curves consistently in one direction (e.g., rightward in Northern Hemisphere analog) forming a smooth, asymmetric arc as it moves outward from the release point.
Summary of Experimental Principles
In a rotating reference frame, moving fluids experience an apparent deflection force (Coriolis force) perpendicular to their velocity and the axis of rotation; this causes trajectories of freely moving tracers — like dye in water — to curve rather than follow straight paths.

Prompt Grounding rubric:
level_1: No rotating turntable is visible; no transparent cylindrical tank is present; no dye release is shown; the tank is not shown on a turntable; or none of these three elements (tank, turntable, dye) appear together in the scene.
level_2: A turntable is present but is stationary or spins at a visibly uneven speed; the tank is present but is opaque or not cylindrical; the dye is released, but not from a single fixed point near the water's central surface; or one of the three core elements (turntable, tank, dye source) is missing entirely.
level_3: A transparent cylindrical tank sits on a visibly rotating turntable, and a bright dye is released from a fixed point near the central surface (all three elements are present and correctly identified), but either the dye release does not clearly happen while the turntable is rotating, or the camera angle does not show the tank's interior clearly.
level_4: All three elements are present and correctly arranged in one continuous, stably framed shot: the transparent cylindrical tank, the uniformly rotating turntable beneath it, and the bright dye released from a fixed point near the central surface; none of the three is occluded, swapped for another object, or misrepresented.
level_5: In addition to the 4-point requirements: the turntable's rotation looks steady with no jerking, pausing, or sudden speed change; the tank is clear glass or clear plastic with no visible seams or warping; the dye is released from one single fixed point near the center of the water's surface (not from the tank edge or bottom); the release happens while the turntable is already rotating; and the whole sequence is filmed from one fixed camera position showing the tank's interior without any cut or reframing.

Scientific and Causal Correctness rubric:
level_1: The dye spreads outward in a symmetric, straight-line (radial) pattern with no curving at all; there is no visible sign that the tank's rotation affects the dye's path.
level_2: The dye visibly curves, but in the wrong direction for the tank's rotation sense, or the curving only appears after the dye has stopped moving (not during its outward travel), or the dye forms a swirling vortex that looks caused by stirring or sloshing rather than by the tank's rotation.
level_3: The dye curves away from a straight radial line as it moves outward, in the direction consistent with the turntable's rotation sense, but the curving is interrupted, stops and restarts, or is only visible over part of the dye's visible path.
level_4: The dye's path curves smoothly and continuously away from the radial line for its entire visible motion, in the direction consistent with the turntable's rotation sense; no competing effect (a separate swirling vortex, turbulent mixing, or a straight jet) hides or overrides the curving; the curve is present from the moment the dye starts moving and continues until the dye disperses.
level_5: The dye traces a single, unbroken, smoothly curving path whose curvature comes only from the tank's rotation: no straight segments, no reversals, no secondary curls or spirals; the amount of curvature increases the farther the dye travels from the release point; and there is no visible sign of an outside cause (splashing, dripping, air currents, or the dye clinging to the tank wall) for the curving.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal rupture: the tank appears or disappears between frames, or the dye appears mid-air without visibly emerging from the release point; the video contains an abrupt lighting jump or a black frame that breaks continuity; or the turntable's rotation stops and restarts instantly with no motion blur or deceleration.
level_2: Moderate discontinuities: the turntable's rotation visibly stutters or skips frames; the dye appears in the water before the release action is shown; the release point shifts position relative to the tank center between frames; or the overhead lighting changes in a way inconsistent with a single fixed light source.
level_3: Minor but noticeable inconsistencies: slight jitter in the camera's framing; the rotation shows motion blur while the dye trail shows none (or vice versa); the dye trail is briefly hidden behind the tank rim or a reflection; one or two frames show an implausible shadow position, but no full break in the video occurs.
level_4: Motion throughout is physically plausible: the rotating turntable shows consistent motion blur appropriate to its speed; the dye moves with natural fluid continuity and no sudden jumps in position; the tank center, release point, and dye's point of origin stay in a fixed spatial relationship to each other; and the lighting direction and intensity do not change unexpectedly during the sequence.
level_5: Every frame is coherent with its neighbors: no jitter, no mismatched motion blur, no moments where the dye trail is hidden, and no lighting anomalies; the turntable's rotation is smooth with no visible speed changes; the dye emerges continuously from its fixed release point with an unbroken trail; and the tank's centerline, wall, and water surface stay in the same geometric relationship to one another across the entire video.