Domain: Healthcare — Nutrition & Dietetics
Target concept: Beating egg white albumen to incorporate air and induce foaming

Video generation prompt: Fresh egg white is manually whipped vigorously with a metal whisk in a transparent glass bowl.

Evaluation guide:
(i) Target concept: Mechanical foam formation via protein denaturation and interfacial stabilization in egg white albumen.
Minimum mechanism: Continuous mechanical energy input must induce air entrapment; native globular proteins (e.g., ovalbumin) must partially unfold to adsorb at air-water interfaces and form viscoelastic film preventing coalescence.
(ii)Storyline: Frame 1: Static shot showing fresh egg white as a clear, pooled liquid occupying bottom of transparent glass bowl; metal whisk rests beside or just above surface. → Frame sequence 2–3: Whisk enters liquid, begins rapid circular/upward motion; liquid surface agitates, small bubbles appear at edges. → Frame sequence 4–5: Foam nucleates at whisk-wire contact points, expands upward, gains whiteness and volume, climbs bowl walls. → Frame sequence 6–7: Foam becomes continuous, cohesive, and self-supporting; lifts fully off bowl base when whisk is raised. → Final frame: Stable foam layer persists with no collapse or drainage; whisk wires retain visible foam strands. Perspective: Fixed frontal view, eye-level, centered composition; no occlusion of bowl interior or whisk-liquid interaction zone.

Manual:
Experimental Procedure
1. Place fresh egg white into transparent glass bowl.
2. Hold metal whisk with hand and vigorously whip egg white in circular/upward motion.
Observation of Experimental Phenomena
Egg white transforms from clear viscous liquid to voluminous, white, cohesive foam that clings to whisk wires and rises visibly within the bowl.
Summary of Experimental Principles
Mechanical agitation incorporates air bubbles into egg white albumen; hydrophilic and hydrophobic domains in ovalbumin unfold and stabilize air-water interfaces, forming a rigid, elastic foam network.

Prompt Grounding rubric:
level_1: None of the required elements appear (no egg white, no transparent glass bowl, and no metal whisk), and no whipping action of any kind is shown.
level_2: Only one of the three required elements is present (bowl, or whisk, or a liquid), never all three together; if whipping is attempted it uses the wrong tool (a spoon, bare hand, or electric mixer), or the bowl shown is opaque or not glass.
level_3: Fresh egg white, a transparent glass bowl, and a metal whisk are all present, and a manual whipping motion is shown, but something is off: the whisk is not actually touching the egg white while moving, or the bowl is not resting on a stable surface, or the egg white fills less than half the bowl at the start.
level_4: Everything required at the 3-point level holds, and in addition the whisk stays in contact with the egg white throughout the whipping motion, the bowl stays upright, stationary, and fully transparent, the egg white fills roughly a third to two-thirds of the bowl at the start, and nothing extraneous (no eggshell, yolk, or extra utensil) appears in frame.
level_5: Everything required at the 4-point level holds, and in addition the whisk never travels outside the bowl's rim while whipping, the egg white and any foam it turns into stay entirely inside the bowl with none splashed over the edge, the hand's grip on the whisk handle looks like a natural human hold throughout, and the hand is never shown separated from the whisk once whipping begins.

Scientific and Causal Correctness rubric:
level_1: No foam appears at any point: the egg white stays a clear, unchanged liquid throughout, with no increase in volume, no change in texture, and no visible air bubbles.
level_2: Foam does form, but in a way inconsistent with real egg-white foaming: for example it is tinted yellow, it collapses back to liquid the instant the whisk stops moving, it only shows large unstable bubbles at the rim, or it only appears after whisking has already stopped rather than building up during it.
level_3: Foam builds up in volume while whipping is underway and looks white and fairly uniform, but it has no real structure: it sinks back down to the original liquid level within about a second once the whisk stops, and it never holds a peak or clings visibly to the whisk wires.
level_4: Everything required at the 3-point level holds, and in addition the foam grows progressively as whipping continues, stays white, even, and fine-bubbled, clings to the whisk wires when lifted out, and keeps its height for at least a couple of seconds after whipping stops, with no yellow tint, no separation, and no liquid pooling underneath it.
level_5: Everything required at the 4-point level holds, and in addition the foam keeps building without ever sinking back down while whipping continues, foam pulled up between the wires and the surface stretches into cohesive strands rather than snapping apart, the top of the foam stays smooth without craters or channels of draining liquid, and no bare liquid egg white is ever visible above the foam's base.

Spatiotemporal Consistency rubric:
level_1: The bowl relocates instantly between frames or changes shape; the whisk or the hand vanishes completely in one frame and comes back in a different spot in the next; the room's lighting switches between two clearly different setups within what should be one continuous take; or the bowl spins around by more than 90 degrees with nothing visibly causing it.
level_2: The bowl rocks or tips without anything supporting or knocking it; the whisk's motion looks mechanically wrong: for instance it reverses direction instantly rather than slowing down first; the hand appears already gripping the whisk with no moment of picking it up; or the shadow the whisk casts points a different way than the rest of the scene's lighting would suggest for several seconds running.
level_3: The glass bowl's apparent transparency flickers briefly but the bowl itself never moves or disappears; the whisk tip is occasionally shown overlapping the bowl's rim in a way that looks slightly off, though it never leaves the bowl entirely; the hand's grip on the whisk looks a little inconsistent from moment to moment; the background stays recognizably in the same place even if small details shift.
level_4: Everything required at the 3-point level holds, and in addition the bowl stays put in roughly the same part of the frame the whole time, the whisk stays fully inside the bowl's boundary throughout the motion, the hand's position relative to the bowl and whisk always looks anatomically plausible, and the lighting, the direction of the whisk's shadow, and the reflections on the glass all stay consistent for the entire clip.
level_5: Everything required at the 4-point level holds, and in addition the bowl shows no visible drifting or repositioning at any point, the whisk tip never appears to skip from one location to another, reflections on the glass move smoothly in step with the whisk's motion rather than lagging or jumping, and no frame shows the hand or whisk stretched, warped, or blurred in a way that makes them hard to recognize.