Domain: Natural Science — Chemistry
Target concept: Adding dish soap to an oil–water mixture forms a stable emulsion.

Video generation prompt: Place two identical jars side by side, each containing water and a layer of oil; add dish soap only to the right jar, seal both jars, and shake them vigorously.

Evaluation guide:
(i) Target concept: Surfactant-mediated stabilization of oil-in-water emulsions.
Minimum mechanism: Oil and water are immiscible; without surfactant, dispersed droplets coalesce rapidly upon agitation cessation; with surfactant (dish soap), droplets remain sterically and electrostatically stabilized against coalescence, yielding persistent macroscopic homogeneity.
(ii)Storyline: [Phase 1: Baseline] Two identical jars side-by-side, each showing quiescent, sharply layered water (bottom) and oil (top); [Phase 2: Intervention] Dish soap introduced exclusively into right jar (visible droplet entry), then both jars sealed (lids fully covering openings); [Phase 3: Action] Both jars undergo synchronous, vigorous shaking: liquid inside surges, mixes, and becomes temporarily turbid; [Phase 4: Outcome] Jars held still: left jar clears completely into two distinct layers within seconds; right jar retains uniform, featureless cloudiness with no interface or settling, all observed from fixed frontal viewpoint with no occlusion or framing shift.

Manual:
Experimental Procedure
1. Place two identical transparent jars side-by-side; fill each with equal volumes of water (bottom layer) and oil (top layer).
2. Add dish soap only to the right jar.
3. Seal both jars with lids.
4. Shake both jars vigorously and simultaneously.
Observation of Experimental Phenomena
After shaking stops and jars are held still: left jar rapidly reseparates into two sharp layers; right jar remains uniformly cloudy/milky with no layering — a stable emulsion.
Summary of Experimental Principles
Dish soap acts as a surfactant, reducing interfacial tension between oil and water, enabling oil to disperse into tiny droplets stabilized by soap micelles — forming a stable emulsion.

Prompt Grounding rubric:
level_1: Two jars are not shown; neither jar displays a water layer under an oil layer; dish soap never appears anywhere in the scene; no shaking motion occurs; the two jars are never shown together.
level_2: Two containers appear, but they don't match each other in shape or size; at least one jar shows liquid with no clear water-oil layering; a soap bottle or a soap droplet appears somewhere but is never actually added to the right jar; shaking happens to only one jar, not both; the two jars appear overlapping, stacked, or in separate shots rather than together in the same frame.
level_3: Two identical jars appear together in the same shot; each jar shows two distinct horizontal layers -- a clear or colorless layer at the bottom (water) and a translucent yellowish layer on top (oil); dish soap is visibly added to the right jar only, before it is sealed; both jars are shown sealed with lids; both jars are shaken at the same time, with a hand or visible motion acting on each.
level_4: Everything from the 3-point level still holds, plus: the dish soap touches only the right jar's contents, never the left; both lids are clearly placed on the jars before shaking starts; the shaking motion looks continuous and vigorous on both jars at once, without either jar pausing or being shaken alone; the two jars remain visibly side by side with nothing extraneous placed between or on top of them.
level_5: Everything from the 4-point level still holds, plus: the soap clearly enters the right jar, then the lid is placed, then shaking begins, in that order; both jars share the same orientation, coloring, and lighting from start to finish; nothing blocks the view of either jar; the order of events -- soap addition, sealing, shaking -- is unambiguous, with no confusing skip or reordering of these setup steps.

Scientific and Causal Correctness rubric:
level_1: No difference in emulsion behavior appears between the jars; both jars end up looking the same after shaking -- either both fully separate back into layers, or both stay uniformly cloudy; the oil sits as an intact floating layer in both jars after shaking, or there is no visible difference between them at all.
level_2: A difference appears after shaking, but it runs backwards: the left jar (no soap) stays cloudy/mixed while the right jar (with soap) quickly separates into layers; or both jars look identically cloudy even though soap was added only to the right jar; or the right jar separates faster than the left.
level_3: Once shaking stops and the jars sit still: the left jar quickly separates back into two sharp horizontal layers, with clear water below and a distinct oil layer on top; the right jar stays uniformly cloudy or milky with no visible layering, showing a stable emulsion; this contrast between the two jars is clearly visible on screen at the same point in time.
level_4: Everything described at the 3-point level still applies, and: the left jar's reseparation is complete -- no lingering cloudiness, no suspended droplets, a sharp water-oil boundary -- within the time shown; the right jar shows no reseparation at all, with no clear oil pooling at the top and no clearing at the bottom; the right jar's cloudiness looks even throughout its volume rather than settling into visible bands or clear/cloudy zones.
level_5: Everything described at the 4-point level still applies, and: the contrast between the two jars holds steady for the rest of the video, with the right jar never clearing up even briefly and never separating in just one spot; ordinary surface foam or bubbles from the vigorous shaking may appear in either jar and do not count against the score, since that is a normal result of shaking soapy water; the left jar's oil layer looks about the same thickness and shape as it did before shaking; the right jar's cloudy mixture looks like a fine, even dispersion rather than containing obviously large blobs of oil (larger than roughly a tenth of the jar's height) floating within it.

Spatiotemporal Consistency rubric:
level_1: A jar appears to jump to a different spot or suddenly change size between frames; the lighting suddenly changes, such as a shadow disappearing and reappearing; the oil or water inside a jar deforms in an impossible way, such as the oil layer bending upward on its own or water flowing the wrong direction; shaking appears to start without a hand or force ever touching the jar.
level_2: A minor but noticeable glitch appears: one jar flickers in and out of view briefly; a lid appears or disappears without anyone placing or removing it; the soap seems to pass straight through the jar wall instead of entering through an opening; the two jars are shaken in visibly different directions or rhythms; the shaking motion briefly freezes or repeats a frame.
level_3: Both jars stay in the same place, size, and orientation throughout; neither jar's shape looks bent, stretched, or warped; the light on both jars and their shadows doesn't shift as the scene plays out; the shaking motion looks physically plausible -- a hand or visible force contacts each jar before it starts moving, and the lids stay attached during shaking; there are no jarring cuts -- the video plays as one continuous take or a seamless transition.
level_4: Everything from the 3-point level still holds, plus: the two jars' positions relative to each other don't shift in a way that would suggest the camera moved; the liquid inside each jar responds the way real liquid would when shaken -- sloshing and mixing, then settling -- rather than staying rigid; hands never appear to pass through the jar's glass; there's no sudden, unexplained jump in brightness or contrast beyond what the shaking motion itself would cause.
level_5: Everything from the 4-point level still holds, plus: the liquid's motion matches what real inertia would look like -- an initial surge from the shake, followed by movement that gradually settles down rather than stopping instantly; the liquid surface never looks frozen or as if it's sliding unnaturally; no blur ever obscures whether a jar is layered or emulsified; the jars' glass reflects light consistently throughout, without random flickers or inconsistent glare.