Domain: Healthcare — Pharmacy
Target concept: Solubility of Crystalline and Amorphous Sugar Glasses in Water

Video generation prompt: Two identical transparent beakers containing equal volumes of room temperature water are placed side by side; the beaker on the left is added with crystalline sugar, and the beaker on the right is added with sugar glass fragments, both being stirred gently with the same force.

Evaluation guide:
(i) Target concept: Differential aqueous interaction kinetics between crystalline and amorphous sugar solids due to structural energy differences.
Minimum mechanism: Sugar glass must retain physical integrity long enough to be identifiable as fragments at t=0, then undergo visibly rapid dissolution (edges softening, shards fracturing, and fine cloudy material dispersing into the water), driven by its higher free energy and disordered structure; crystalline sugar, despite being intrinsically highly water-soluble, must dissolve far more slowly under the same brief stirring, so its grains stay visibly intact and largely undissolved over the observed timescale.
(ii)Storyline: [Frame 0–1] Static wide shot: two identical beakers side-by-side, filled equally with clear water, empty except for labeled positions. [Frame 2–3] Crystalline sugar poured into left beaker (granular fall, settling with audible impact implied by visual particle bounce); sugar glass fragments dropped into right beaker (shard-like impact, minor splash, fragments rest visibly jagged). [Frame 4–7] Identical stirring tools enter both beakers synchronously; motion induces gentle vortex in both; left: sugar particles rotate but retain shape and separation; right: fragments wobble, chip at edges, release fine particulates causing localized cloudiness. [Frame 8–10] Stirring ceases; left beaker returns to still clarity with intact grains; right beaker shows persistent turbidity and suspended micro-fragments near bottom/sides. Fixed frontal viewpoint; full beaker height always visible; no occlusion; lighting uniform and diffuse.

Manual:
Experimental Procedure
1. Place two identical transparent beakers side-by-side, each filled with equal volume of room temperature water.
2. Add crystalline sugar to left beaker; add sugar glass fragments to right beaker.
3. Simultaneously stir both beakers gently with identical tools using same motion.
Observation of Experimental Phenomena
Crystalline sugar remains visibly granular and undissolved; sugar glass fragments rapidly fragment, cloud the water, and may form transient surface film — no full dissolution observed in 10 seconds.
Summary of Experimental Principles
Crystalline sucrose is actually highly water-soluble (on the order of 2 kg per liter of water at room temperature) — its ordered crystal lattice does not make it "low solubility," it makes dissolution slow, so under brief, gentle stirring the grains stay visibly intact within the short observed time window. Amorphous sugar glass has no long-range crystalline order and higher internal free energy, so it hydrates and breaks down much faster under the same conditions: fragments crack, soften, and shed fine, cloudy amorphous material into the water. The contrast in this clip reflects a difference in dissolution rate (kinetics), not a difference in whether the sugar is capable of dissolving.

Prompt Grounding rubric:
level_1: Neither of the two required beakers is clearly shown, or only one appears; water is not visibly present in one or both beakers; or crystalline sugar and sugar glass fragments are both missing from view, or only one of the two materials appears anywhere in the clip.
level_2: Two similar beakers with visible water both appear, but the setup is scrambled or mis-arranged: crystalline sugar ends up in the right-hand beaker instead of the left, the glass fragments end up in the left-hand beaker instead of the right, both materials are dropped into a single beaker, the two beakers are shown far apart or one after another rather than next to each other, or a stirring implement is used in only one of the two beakers.
level_3: The left beaker clearly contains crystalline sugar and the right beaker clearly contains sugar glass fragments, both beakers sit next to each other and hold a visibly similar volume of water, and a stirring implement enters and moves inside both beakers at some point; but the two stirring actions do not clearly happen together, for example one starts noticeably before the other or one beaker is left unstirred for a stretch while the other is being stirred.
level_4: Everything described at the 3-point level is present, and in addition the same type of stirring implement (matching size and shape) is used in both beakers, both beakers stay fully in view with nothing blocking either one, and the two stirring motions start together and proceed with a similar rhythm and direction on both sides.
level_5: Everything described at the 4-point level is present, and in addition the crystalline sugar is clearly visible as separate white granular pieces (not already dissolved, not powdered, not clumped into a solid mass) and the sugar glass fragments are clearly visible as irregular, glassy, semi-transparent shards (not crystalline grains, not a fine powder); the camera holds one fixed side-by-side framing of both beakers from setup through the end of stirring, with no cut or camera move that would prevent a direct left-versus-right comparison.

Scientific and Causal Correctness rubric:
level_1: Neither beaker shows any visible change in the sugar during stirring, or both beakers behave identically (both dissolving fast, or both staying fully intact), or the order is reversed so that the crystalline sugar visibly disappears before the glass fragments show any change at all.
level_2: The crystalline sugar in the left beaker sits completely unchanged with zero visible response to stirring, not even minor settling; or the glass fragments in the right beaker vanish completely and instantly with no visible cracking or clouding in between; or the water in the right beaker turns cloudy before stirring has even begun.
level_3: The crystalline sugar grains in the left beaker stay mostly intact and recognizably granular, at most settling slightly, while the sugar glass fragments in the right beaker visibly crack, shed fine particles, and cloud the water around them during stirring; but the two beakers' behavior is not sharply distinct, for instance the left beaker also shows some cloudiness or the right beaker's fragments look nearly as stable as the left beaker's grains.
level_4: The crystalline sugar grains keep sharp, distinct edges throughout stirring with no visible loss in grain count or shape, while the sugar glass fragments visibly chip, soften at the edges, and release a fine cloudy haze concentrated near where the fragments sit; the left beaker's water stays essentially as clear as it was before stirring began, showing the crystalline sugar dissolving far more slowly than the glass under these brief, gently stirred conditions.
level_5: The contrast grows visibly through the clip: the sugar glass fragments progressively lose their shape (edges rounding, shards splitting into smaller pieces) while the surrounding water becomes cloudier the longer stirring continues and that cloudiness persists once stirring stops; meanwhile the crystalline sugar grains in the left beaker keep their angular shape and sharp contrast against clear water for the whole clip, with no cloudiness, film, or grain breakdown at any point, showing that the glass's disordered, higher-energy structure lets it hydrate and break down much faster than the same mass of ordered crystalline sugar over this short timescale.

Spatiotemporal Consistency rubric:
level_1: One or both beakers suddenly jump to a different position or size between frames, or one beaker is missing for several consecutive frames and then shows up again unchanged; the water level in either beaker changes abruptly with no pouring or spilling shown to explain it; the stirring implement is present one moment and gone the next without ever being lifted out; or the light on the beakers changes abruptly partway through, such as a cast shadow suddenly swinging to a new angle for no visible reason.
level_2: Both beakers keep the same position and size, but one clear flaw is visible; for example the two beakers are shown from noticeably different camera angles as if treated inconsistently, the stirring implement in one beaker jerks or skips between positions instead of moving smoothly, the water surface's ripples freeze for a moment and then resume, or the reflected highlight on the glass flickers on one beaker but not the other.
level_3: Both beakers hold their size, shape, and position steady, and both stirring implements move smoothly through their liquids, and the water surface deforms believably as it is stirred in each beaker; but a small flaw is visible, such as the cast shadows on the two beakers falling at slightly different angles, or one beaker's stirring motion briefly looking a half-step out of rhythm with the other's.
level_4: Everything described at the 3-point level is present, and in addition neither beaker appears to slide or float relative to the desk or background as the camera or objects move, the stirring implement stays at a consistent depth relative to each beaker's rim and wall, and the curved meniscus of the water surface matches the curvature of the glass consistently in both beakers.
level_5: Everything described at the 4-point level is present, and in addition the motion in both beakers is smooth frame to frame with no stutter or motion-blur mismatch between the two sides, no distortion appears at the rims or curved walls of either beaker, no reflection from one beaker incorrectly appears inside the other beaker's glass, and the desk and background behind both beakers stay fixed in texture and brightness for the whole clip.