Domain: Healthcare — Pharmaceutical Chemistry
Target concept: Hygroscopicity of Drugs: Moisture Adsorption and Caking

Video generation prompt: Take a small amount of citric acid powder and place equal portions into two shallow dishes, positioned side by side in the same shot. Cover each dish with its own small transparent dome to create two separate micro-environments in the same frame: a few drops of water or mist inside one dome keep that space at about 80% relative humidity, visible as condensation/fog on the dome's inner wall, while a visible packet of desiccant beads inside the other dome keeps that space dry. After a few minutes of exposure (shown as a brief time-lapse), tilt each dish together with its dome, as one rigid unit, to observe any changes in how the powder moves.

Evaluation guide:
(i) Target concept: Hygroscopic caking driven by moisture adsorption at the solid-air interface.
Minimum mechanism: Under the high-RH dome, water vapor adsorbs onto the citric acid grain surfaces, forming a thin surface moisture film that creates capillary liquid bridges between neighboring grains; under the dry dome, negligible moisture adsorbs, so the crystalline grains stay separate and free-flowing.
(ii) Storyline: [Frame 0-2] Two shallow dishes with equal amounts of loose white citric acid powder sit side by side, each enclosed by its own small transparent dome; the humid dome's inner surface shows visible condensation/fog while the dry dome contains a visible desiccant packet — no text labels appear. [Frame 3-5] After the exposure interval (shown as a brief time-lapse), both dish-and-dome assemblies begin tilting together, each rotating as one rigid unit around the same horizontal axis at the same rate. [Frame 6-8] A difference in how the powder responds becomes visible: in the humid dish, the powder holds together as a single coherent mass as the dish tilts; in the dry dish, individual grains separate and roll down independently. [Frame 9-10] Both dishes settle into their final tilted pose and the difference in the powder's behavior remains visible and stable. Perspective: fixed frontal view, no camera motion; both complete dish-and-dome assemblies stay fully in frame throughout.

Manual:
Experimental Procedure
1. Place two identical shallow dishes side by side in a fixed frame, each holding an equal amount of citric acid powder.
2. Cover each dish with its own small transparent dome so the two dishes sit in two separate, visually distinguishable micro-environments within the same shot: one dome's interior shows visible condensation/fog (80% RH), the other dome contains a visible desiccant packet (dry air); no text labels are used.
3. Allow a few minutes of exposure (shown as a brief time-lapse).
4. Tilt each dish together with its dome, as one rigid unit, at the same angle and speed, simultaneously for both.
Observation of Experimental Phenomena
In the humid dome's dish: the powder has adsorbed enough surface moisture to form capillary bridges between grains, so it holds together as a cohesive mass and resists sliding when tilted.
In the dry dome's dish: the powder has adsorbed negligible moisture, so the grains remain separate and flow/roll freely when tilted.
Summary of Experimental Principles
Citric acid is hygroscopic: at 80% RH it adsorbs a surface moisture film that dissolves grain surfaces and forms capillary bridges between adjacent grains, causing caking. In dry air, negligible moisture is adsorbed, so the powder remains a free-flowing crystalline solid.

Prompt Grounding rubric:
level_1: No shallow dishes are shown, or citric acid powder is missing from them, or only one dish ever appears in the shot; the two dishes show no visible environmental difference between them (no condensation/fog on either dome, no desiccant packet visible, both look identical); the dishes are never tilted.
level_2: Two dishes with white powder are present, but neither dome clearly shows the condensation/fog vs. desiccant-packet contrast, or only one of the two visual cues is present; the tilt happens for only one dish, or the two dishes never appear together in the same frame at the same time.
level_3: Two shallow dishes holding white powder sit together in the same fixed frame, each covered by its own transparent dome; one dome's interior clearly shows condensation/fog and the other clearly shows a visible desiccant packet; both dishes are tilted, together with their domes, within the same continuous sequence; no unrelated objects or actions appear.
level_4: All elements of score 3 are present AND the two dish-and-dome assemblies match in size, shape, and material and hold visually equal amounts of powder; both start tilting at the same visible moment and tilt at the same rate, each dome moving as one rigid unit with the dish it covers.
level_5: All elements of score 4 are present AND both dish-and-dome assemblies stay fully in frame for the entire sequence with no cropping or repositioning; the condensation/fog and the desiccant packet remain the only visual cues distinguishing the two sides (no extra text, hands, tools, or overlays beyond these two cues); powder stays inside its dish before and during the tilt, and the tilt geometry of the two assemblies stays symmetric throughout.

Scientific and Causal Correctness rubric:
level_1: No difference in how the powder moves is observed in either dish after tilting; the powder in both the condensation-dome dish and the desiccant-dome dish behaves identically (both flow freely, or both stay put) regardless of which dome they were under.
level_2: One dish's powder shows a slight shift when tilted, but there is no clear difference between the two dishes; or both dishes show the same clumping, or both show the same free flow, with no relationship to which dome (condensation vs. desiccant) covered them.
level_3: After tilting, the powder in one dish flows freely as separate rolling grains while the powder in the other dish holds together and resists sliding as a single mass; this difference is clearly visible and continues to be visible across multiple frames after the tilt.
level_4: All elements of score 3 are present AND the dish under the condensation dome (humid side) shows the grains adhering together with no visible grain-to-grain separation during the tilt, while the dish under the desiccant dome (dry side) shows the grains fully separating and rolling individually with no adhesion; the assignment of cohesion to the humid side and free flow to the dry side is never reversed.
level_5: All elements of score 4 are present AND the cohesive mass in the humid dish stays intact as one piece with no loose grains breaking off; the grains in the dry dish move completely freely with no sticking, bridging, or partial clumping anywhere; at no point does either dish show a mixed or ambiguous in-between behavior.

Spatiotemporal Consistency rubric:
level_1: Either dish jumps to a new position between frames instead of tilting smoothly; powder vanishes from or appears in a dish mid-tilt without a gradual cause; a dome separates from, floats above, or passes through its dish instead of moving with it; a dish or dome visibly distorts or breaks apart; the tilting motion freezes, jumps backward, or restarts partway through.
level_2: The tilt motion stutters or freezes for two or more consecutive frames; the two dish-and-dome assemblies drift out of their side-by-side alignment between the start and end of the tilt; a dome appears to slide or rotate independently of the dish beneath it; the powder's texture visibly pixelates or warps during the motion.
level_3: Neither dish-and-dome assembly teleports or breaks apart; the tilt proceeds as one continuous, unbroken motion for both assemblies; each dome stays attached to and moves together with its dish as a single rigid unit throughout the tilt; the two assemblies keep the same side-by-side spacing and relative orientation from the first frame to the last.
level_4: All elements of score 3 are present AND the two assemblies tilt at a visually even, uninterrupted speed with no sudden speed-up or slow-down; the rims of the dishes and the outlines of the domes stay aligned with the powder and with each other frame to frame, without any visible skip or offset; the camera does not pan, zoom, or refocus during the sequence.
level_5: All elements of score 4 are present AND the powder, dish rims, and domes stay visually sharp and stable rather than smearing or blurring as the assemblies tilt; no double outlines, ghost images, or halo artifacts appear around the dishes, domes, or powder in any frame; the apparent depth and relative scale of the two assemblies stay consistent with each other throughout the sequence.