Domain: Natural Science — Physics
Target concept: Capillary Rise of Water in Tissues Compared to Oil

Video generation prompt: Two identical paper strips are placed side by side: the left one is immersed in blue water, and the right one is immersed in yellow cooking oil. The movement of the liquid upward along the paper strips over time is observed.

Evaluation guide:
(i) Target concept: Capillary rise magnitude depends on liquid–solid interfacial adhesion and surface tension, not just viscosity or density.
Minimum mechanism: Paper must be porous and hydrophilic; water must be polar and form hydrogen bonds with cellulose; oil must be nonpolar and exhibit weak adhesion to cellulose; both liquids must remain immiscible and unmixed; gravity and cohesion act as counterforces to capillary ascent.
(ii)Storyline: Frame 0–1: Two dry, identical, vertically aligned paper strips appear side-by-side, each above its own container (blue water left, yellow oil right); immersion confirmed by liquid meniscus contacting paper base. Frame 2–5: Blue front begins ascending left strip; yellow front begins ascending right strip — both fronts move continuously upward, confined to paper width, with no lateral bleed. Frame 6–10: Blue front advances visibly farther than yellow front; height gap widens steadily; no reversal, pause, or mixing; all objects remain fully visible, fixed in frame, under stable lighting; final frame shows unambiguous height differential with sharp, natural wet/dry interfaces.

Manual:
Experimental Procedure
1. Place two identical dry paper strips side-by-side on a flat surface.
2. Position a container of blue water beneath the left strip so its bottom edge is immersed.
3. Position a container of yellow cooking oil beneath the right strip so its bottom edge is immersed.
4. Observe upward movement of liquids along both strips for 10 seconds.
Observation of Experimental Phenomena
Blue water rises significantly higher on the left paper strip than yellow oil rises on the right paper strip. Both liquids ascend vertically within the paper matrix without lateral spread or color mixing.
Summary of Experimental Principles
Water exhibits stronger capillary action in cellulose-based paper than cooking oil due to higher surface tension and better adhesion to hydrophilic fibers — resulting in faster and greater vertical rise.

Prompt Grounding rubric:
level_1: Neither of the two paper strips is visible, or only one strip/liquid pair appears without its counterpart; the strips are arranged one behind the other instead of side by side; the lower ends of the strips are not shown touching any liquid; the blue water and yellow oil are not visually distinguishable in color from one another.
level_2: Both paper strips and both liquids (blue, yellow) are present and placed beside each other, but at least one of the following is missing: the left strip's base is not shown immersed in the blue liquid, the right strip's base is not shown immersed in the yellow liquid, one strip is cropped so its top or bottom is out of frame, or the two liquid containers are not both visible on screen.
level_3: Two visually matching paper strips stand side by side, each in its own container: the left one's base sits in blue-colored water, the right one's base sits in yellow-colored oil; both containers and both full strips (from base to tip) are visible within a single continuous shot.
level_4: Beyond level 3, the immersed lower portion and the rising upper portion of each strip stay unobstructed by hands, labels, or other objects for the whole clip; the rim of each container stays lined up with the base of its strip rather than drifting apart from it.
level_5: Beyond level 4, the two strips match each other in height, width, and paper texture, and sit at mirrored positions to the left and right of the frame's center; the two containers are the same shape and size as each other; at the very start, the blue water and yellow oil sit at the same fill level in their containers before either strip begins absorbing.

Scientific and Causal Correctness rubric:
level_1: Neither strip shows any upward wicking of liquid; or both strips rise by the same amount; or the blue water climbs the right-hand (oil) strip while the yellow oil climbs the left-hand (water) strip; or either liquid's color changes as it climbs (e.g., the blue turning green, or the yellow turning orange); or the liquid spreads sideways across a strip rather than climbing upward.
level_2: One strip shows some wetting, but as scattered blotches or drips instead of a single rising front; or a liquid appears to move downward or jump partway up a strip instead of climbing steadily; or dye from one liquid shows up on the other strip (a blue tinge on the oil strip, or vice versa); or wetting begins before the strip touches its liquid, or keeps advancing after the strip has been lifted out.
level_3: Blue water climbs the left strip and yellow oil climbs the right strip, each as one continuous rising front confined to the width of its own strip, with neither liquid dripping over the top edge nor bleeding out the sides; the blue and yellow stay visually distinct from each other the whole time they are climbing.
level_4: Beyond level 3, the blue front on the left strip climbs noticeably higher than the yellow front on the right strip by the end of the clip; neither liquid's color fades, mixes, or shifts hue as it rises; the dry paper just above each front looks the same texture as before wetting, with a visible crisp line marking the wet/dry boundary.
level_5: Beyond level 4, the height gap between the blue front and the yellow front keeps growing steadily rather than closing, stalling, or reversing; both fronts start climbing at essentially the same moment right after immersion, so neither strip gets a head start; by the end of the clip there is an unmistakable, easily-read difference in how far up each liquid has traveled.

Spatiotemporal Consistency rubric:
level_1: A strip that was dry a moment ago is shown already soaked partway up with no climbing motion shown in between; one of the two liquid containers is missing from the very first shot and only appears partway through the clip with no hand ever placing it down; the light on the scene suddenly brightens, dims, or the shadows jump to a new angle between moments; a strip's edge suddenly bends, stretches, or thins out; or the camera abruptly cuts to a different angle, zooms, or spins mid-shot.
level_2: A strip's position shifts sideways by a noticeable fraction of its height (roughly more than 10%) or its tilt changes noticeably from one moment to the next with no hand touching it; the liquid level inside a container rises or falls by an amount that does not match what its strip has absorbed; the edge of a container or the tabletop behind the strips flickers or shifts slightly out of alignment between moments.
level_3: Both strips stay in the same spot on the table for the whole clip, and both containers stay where they were set down; each liquid front's climb reads as continuous motion, never freezing then suddenly jumping to a new height; the rising liquid stays visibly anchored to its own strip rather than looking detached from the paper.
level_4: Beyond level 3, neither strip leans, sways, or rotates over the course of the clip; each container's rim stays lined up under its strip's base the whole time; the direction and strength of the light on the scene stay constant, so the shadows the strips and containers cast do not swing to a new angle partway through.
level_5: Beyond level 4, each liquid front's rise looks like one smooth, unbroken climb with no visible stutter or sudden jump in height; the wetted paper's color and sheen darken gradually as the front passes, with no abrupt flash or smear; the whole scene plays as one continuous shot with no visible freeze or repeated moment interrupting either strip's rise.