Domain: Healthcare — Medicine
Target concept: Hygroscopic drug powders absorb moisture in humid air and undergo caking.

Video generation prompt: Two identical shallow dishes are placed side by side, each containing fine white powder. One dish is placed in a humid environment, while the other is kept in dry indoor air. The dishes are periodically tilted to observe the formation of lumps.

Evaluation guide:
(i) Target concept: Hygroscopic caking as moisture-induced solid-state cohesion in pharmaceutical powders.
Minimum mechanism: Ambient water vapor must adsorb onto particle surfaces → form liquid bridges → generate capillary forces → overcome interparticle repulsion → cause irreversible agglomeration upon mechanical disturbance (tilting).
(ii)Storyline: Frame 0–2: Static shot showing two identical shallow dishes side-by-side, each filled with uniform fine white powder; humid dish is proximal to visible moisture cue (e.g., localized mist), dry dish is not. Frame 3–5: Simultaneous or sequential gentle tilting of both dishes: powder flows freely in dry dish; humid dish powder resists flow, then reveals static lumps adhering to dish base/sides. Frame 6–10: Return to level orientation; lumps persist only in humid dish; dry dish powder resettles into homogeneous layer. Perspective: Fixed frontal medium-close shot, full dishes in frame, no occlusion, consistent lighting, no camera motion.

Manual:
Experimental Procedure
1. Place two identical shallow dishes side-by-side.
2. Fill each with identical fine white powder.
3. Expose left dish to humid air (e.g., near steam or moist chamber); keep right dish in dry indoor air.
4. Tilt both dishes gently and simultaneously to observe flow behavior.
Observation of Experimental Phenomena
After tilting, lumps form and adhere in the humid-exposed dish; powder in dry dish remains free-flowing and unclumped.
Summary of Experimental Principles
Hygroscopic drug powders absorb moisture in humid air and undergo caking — a physical state change from free-flowing solid to cohesive solid mass due to capillary bridging between particles.

Prompt Grounding rubric:
level_1: No shallow dishes present; no fine white powder visible; the two containers described in the setup never appear next to one another at all; no humid vs dry environmental contrast implied; no tilting action shown; no lumps observed.
level_2: Two containers are present but not shallow dishes (e.g., beakers, jars, or undefined vessels); powder is present but not fine and white (e.g., granular, colored, or clumped at start); the two containers are positioned apart from each other (e.g., far apart, stacked, or in separate shots) rather than adjacent; tilting action is absent or performed on only one container; lumps are absent in both.
level_3: Two shallow dishes are present and placed side-by-side; both contain fine white powder at the initial frame; a humid-vs-dry environmental cue differentiates the two dishes (e.g., visible condensation or mist near one dish, clear dry air near the other); tilting action is performed on both dishes at least once; no extraneous objects or actions appear beyond the stated setup.
level_4: All elements from score 3 are satisfied AND the environmental contrast is unambiguous and sustained: the humid cue (e.g., condensation, mist, or a visible moisture source) stays visibly present near one dish for the entire clip, and the dry cue (e.g., clear air or a visible desiccant) stays near the other; both dishes are tilted synchronously or in immediate succession, at more than one point in the video; the two dishes remain identical to each other in shape, size, and material throughout.
level_5: All elements from score 4 are satisfied AND both dishes maintain identical shape, size, material, and orientation relative to the camera throughout every tilt; no object enters or exits frame; the viewpoint remains fixed; the number and timing of tilts performed on the humid-context dish match those performed on the dry-context dish (same count, same approximate spacing), so any visual difference between the dishes reflects environment rather than unequal handling.

Scientific and Causal Correctness rubric:
level_1: Powder changes color (e.g., yellowing, browning), dissolves, liquefies, or disappears; lumps form in both dishes or only in dry dish; powder flows like liquid during tilt; no state change aligns with hygroscopic caking.
level_2: Lumps appear in one dish but powder in that dish is already clumped before tilting; or lumps appear before any tilting; or lumps appear instantly upon dish placement without moisture exposure time; or powder in humid dish disperses instead of caking.
level_3: Fine white powder is initially uniform in both dishes; after tilting, lumps appear in only one dish; lumps are solid, irregularly shaped aggregates adhering to dish surface; no dissolution, melting, or color change occurs; lumps remain after tilting stops.
level_4: All elements from score 3 are satisfied AND lumps appear only after tilting in the humid-context dish (not before); lumps do not detach or roll freely: they remain adhered and retain structural integrity; powder in dry dish remains fully free-flowing and non-cohesive across all tilts.
level_5: All elements from score 4 are satisfied AND lumps in humid dish grow progressively larger/more numerous with each successive tilt (no regression); dry dish powder exhibits zero cohesion: individual grains remain visibly distinct and mobile during every tilt; no grain bridging, surface wetness, or sheen appears in dry dish at any point.

Spatiotemporal Consistency rubric:
level_1: The dishes or powder jump between states with no visible transition: e.g., a dish appears already tilted with no motion leading up to it, powder disappears or reappears between frames, or lumps are visible in a frame with no prior sign of clustering; a single tilt contains more than one abrupt stop-and-restart; the moisture cue near the humid dish (mist or condensation) appears or vanishes instantly rather than being continuously present; either dish's framing flips between a side view and a top-down view with no visible camera move.
level_2: One dish rotates out of the frame during a tilt while the other stays fully visible; lumps appear discontinuously: absent in one frame, then fully formed two frames later with no visible intermediate clustering of grains; powder during a tilt behaves implausibly (flowing uphill, or holding a stable arch in mid-air); the background shifts position relative to the dishes even though neither dish nor the camera is shown moving.
level_3: Both dishes remain fully visible and in place throughout; each tilt is smooth and continuous rather than snapping between angles; any lumps that appear build up gradually over at least two consecutive frames rather than popping into being; neither dish flickers, warps, or shows a fractured edge; the room's light source stays in one place, so the moisture sheen near the humid dish and the flat, matte look of the dry powder both keep the same brightness and shading from the first frame to the last.
level_4: All elements from score 3 are satisfied AND the tilts on the two dishes are either clearly synchronized or clearly sequential, never overlapping in a way that's ambiguous; both dishes keep the same scale and viewing angle relative to the camera across every frame; no lens warping is visible at either dish's rim; no blur or ghosting obscures whether the powder surface is lumpy or smooth.
level_5: All elements from score 4 are satisfied AND the tilting motion changes speed smoothly with no visible jump in rotation speed between frames; any lump that forms visibly grows out of neighboring grains drawing together rather than materializing all at once; no frame is skipped, frozen, or repeated; the powder grains keep a consistent depth relationship (nearer grains still overlap farther ones the same way throughout), so nothing looks like it jumped in depth.