Domain: Healthcare — Pharmacy
Target concept: Difference in Dissolution Rate between Dispersible Tablets and Conventional Tablets

Video generation prompt: Two identical transparent beakers containing distilled water are placed side by side. A dispersible tablet is placed in the left beaker, and a conventional tablet is placed in the right beaker. Both are gently stirred with the same force, and the dissolution process is observed.

Evaluation guide:
(i) Target concept: Dissolution rate difference arising from tablet formulation-driven disintegration kinetics.
Minimum mechanism: Dispersible tablets must structurally fail (disintegrate) before dissolution; conventional tablets must remain physically cohesive while dissolving gradually at the surface; water must act as passive medium, not reactant, so no chemical color change or gas evolution occurs.
(ii)Storyline: Frame 0–1: Static shot showing two identical beakers with clear liquid, empty. → Frame 2–3: Both tablets placed simultaneously: left (dispersible), right (conventional). → Frame 4–6: Stirring begins synchronously in both beakers with identical tool entry and motion. → Frame 7–9: Left tablet visibly fractures into numerous small particles that suspend uniformly; right tablet shrinks slowly with intact core remaining. → Perspective constraint: Fixed frontal, eye-level, centered composition; no zoom, pan, or tilt; full beaker height and liquid surface always visible; no occlusion of tablet–liquid interface.

Manual:
Experimental Procedure
1. Place two identical transparent beakers side-by-side on a flat surface.
2. Fill both with equal volumes of distilled water (clear, colorless liquid).
3. Simultaneously place one dispersible tablet in left beaker and one conventional tablet in right beaker.
4. Stir both beakers gently and identically using the same tool and motion.
Observation of Experimental Phenomena
- Left beaker: dispersible tablet rapidly disintegrates into fine particles, forming a uniform cloudy suspension.
- Right beaker: conventional tablet erodes slowly, retaining visible solid mass; liquid remains mostly clear with minimal localized cloudiness.
Summary of Experimental Principles
Dispersible tablets contain superdisintegrants and porous structures enabling rapid water penetration and capillary action, resulting in fast disintegration (<3 min). Conventional tablets use binders and lower porosity, slowing water ingress and dissolution—requiring longer time and often mechanical agitation for full dissolution.

Prompt Grounding rubric:
level_1: No transparent beakers are shown, or only one beaker appears, or no tablets are visible, or the two beakers are not placed side by side, or both tablets placed are the same type (e.g., two conventional or two dispersible tablets), or the liquid is visibly colored or opaque rather than clear.
level_2: Two beakers appear side by side, but something essential is wrong: one beaker is a different shape/size or is opaque rather than transparent; a tablet is missing, or what's placed is actually a capsule or powder rather than a tablet; the stirring implement differs between the two beakers; or a tablet is already dissolving on screen with no visible placement action.
level_3: Two identical transparent beakers holding clear liquid sit side by side; a dispersible tablet is placed into the left beaker and a conventional tablet is placed into the right beaker; at the moment each tablet enters the liquid, both are solid and intact with no dissolution yet visible; the same type of stirring implement is used in both beakers.
level_4: All conditions for score 3, AND stirring begins in both beakers at essentially the same moment, AND both tablets stay fully intact for the first few frames after being placed in (no instant dissolving), AND the two beakers' positions relative to each other and the camera framing stay fixed for the whole clip, AND no hand, label, or on-screen text blocks the view of either beaker.
level_5: All conditions for score 4, AND the left (dispersible) tablet is visually identifiable by a scored or porous surface and the right (conventional) tablet by a smooth, dense surface, so a viewer can always tell which beaker holds which tablet, AND both tablets are placed into their beakers before any stirring begins, AND the stirring implement enters and moves in both beakers with matching timing and motion path.

Scientific and Causal Correctness rubric:
level_1: Neither beaker shows any dissolution; or both tablets dissolve at essentially the same rate and to the same extent; or the dispersible tablet in the left beaker dissolves more slowly than the conventional tablet in the right beaker (the effect is reversed); or the liquid's color or clarity changes for a reason unrelated to the tablets.
level_2: Dissolution happens in only one beaker while the other tablet sits there unchanged; or the dispersible tablet breaks into a few large chunks that never disperse further while the conventional tablet fully disappears; or both tablets are completely gone within the first couple of seconds of stirring, leaving no time to see a rate difference.
level_3: The left (dispersible) tablet visibly breaks apart into many small fragments that spread through the water noticeably faster than the right (conventional) tablet, which instead shrinks slowly from the outside while keeping an intact solid core; the left beaker's liquid turns cloudy/suspension-like clearly before the right beaker's does.
level_4: All conditions for score 3, AND the left beaker reaches a fully dispersed state (no visible solid fragments remaining) while the right beaker still has an identifiable solid piece of tablet, AND neither beaker shows the dissolved material re-forming into a solid or clumping back together.
level_5: All conditions for score 4, AND by the end of the clip the left beaker's liquid is uniformly cloudy/milky with fragments spread evenly rather than settled at the bottom, AND the right beaker's liquid stays mostly clear except for a small cloudy patch right around its remaining tablet piece, AND at no point does the right beaker show finer particles than the left beaker, AND both beakers' dissolution only ever progresses forward with nothing re-solidifying.

Spatiotemporal Consistency rubric:
level_1: Either beaker or the stirring implement teleports to a new position between frames; a tablet appears in or disappears from a beaker with no placement action shown; the lighting turns on/off or changes abruptly with no visible source; a beaker's shape visibly warps or distorts partway through the clip.
level_2: One beaker drifts sideways slightly between frames while the other stays put; the stirring implement's thickness or transparency changes inconsistently from frame to frame; a tablet suddenly rotates or flips with nothing touching it; the liquid level in a beaker changes even though nothing is being added, removed, or splashed.
level_3: Both beakers and the stirring implement keep the same position and orientation for the whole clip; neither tablet nor beaker vanishes, duplicates, or morphs into a different shape; the stirring motion looks continuous and physically plausible with no sudden freezing or unnatural speed change; the liquid surface moves smoothly as it is stirred.
level_4: All conditions for score 3, AND the stirring implement or a hand never blocks the full view of both beakers at the same time, AND the camera shows no panning or zooming, AND the liquid's motion in each beaker visibly matches where and how it is being stirred, AND no frame shows a sudden jump or skip in the stirring motion.
level_5: All conditions for score 4, AND the stirring implement keeps the same size, angle, and depth relative to both beakers across the whole clip, AND the rims and liquid surfaces of the two beakers stay level with each other throughout, AND the overall brightness of the scene never flickers beyond what the stirring motion itself would naturally cause, AND neither beaker's transparency or outline shows glitchy artifacts (e.g., a beaker briefly turning opaque or its edge flickering).