Domain: Natural Science — Physics
Target concept: Pour 80°C hot water into a transparent glass cup, and confirm that white steam immediately and visibly rises from the rim of the cup. The cup's walls also become warm to the touch, but this warming is a tactile effect that the camera cannot directly confirm — the steam plume is the phenomenon that is clearly visible.

Video generation prompt: Place an empty transparent glass cup on the table. Carefully pour hot water into the cup, filling it to a level below the brim. During the pouring process and for a short period after completion, keep the camera focused on the rim of the cup and the outer wall of the glass.

Evaluation guide:
(i) Target concept: Visible generation of a white steam plume from the rim of a glass cup when hot water is poured in, driven by water vapor condensing into fine droplets in the cooler air right at and above the rim.
Minimum mechanism: Hot water at roughly 80°C is poured into the cup → water vapor rising off its surface reaches the cooler ambient air at the rim → the vapor condenses into a fine mist of droplets → this forms a visible white plume that rises from the rim. (The glass wall itself also warms up by conduction from the hot water, which would feel warm if touched, but this warming is not something a camera can visually confirm on its own, so it is not scored as a visual cue in this task.)
(ii)Storyline: [Frame 0] Empty transparent glass cup stationary on table, rim and outer wall fully visible. [Frame 1–3] Hot water stream enters the cup, filling it below the brim. [Frame 2–5] A white steam plume emerges from the rim (not from inside the cup's lower body) as the first visible phenomenon, beginning during or just after pouring. [Frame 4–8] Steam continues to rise cohesively from the rim for a few seconds after pouring stops, then gradually thins out and stops. Perspective: Fixed frontal/slightly angled view ensuring the rim and full outer wall remain unoccluded and in-focus throughout.

Manual:
Experimental Procedure
1. Place an empty transparent glass cup upright on a table.
2. Pour hot water (~80°C) into the cup until the level is below the brim, keeping the camera fixed on the rim and outer wall.
Observation of Experimental Phenomena
- White steam rises vertically from the rim during pouring and for a few seconds immediately after.
- The outer glass wall becomes warm to the touch as heat conducts through it from the hot water inside; this warming is a tactile effect, not something the camera can visually confirm, and it is not itself scored as a visual criterion.
Summary of Experimental Principles
Hot water transfers thermal energy through the glass wall by conduction, warming it (detectable by touch, not by sight). Separately, water vapor rising off the hot water condenses in the cooler air right at the rim, forming the visible white steam plume — this is the phase change (condensation) driven by the temperature gradient between the hot water and the surrounding air, and it is the only part of the phenomenon that is directly visible on camera.

Prompt Grounding rubric:
level_1: There is no transparent glass cup in the shot; or the cup already has water in it at the very start; or hot water is never poured in; or the camera view never shows both the rim and the outer wall of the cup; or the cup is opaque, metallic, ceramic, or otherwise not clear glass.
level_2: A transparent, initially empty glass cup is shown, but the pouring action is missing, cut off partway, or blocked from view; or the camera frame leaves out either the rim or the outer wall for the whole clip; or the water ends up poured into some other container instead of this cup.
level_3: An empty transparent glass cup sits on a table; hot water is poured into it; the camera holds a fixed view that keeps both the rim and the outer wall visible continuously during the pour and for a moment after; the final water level is below the rim.
level_4: Everything required for score 3, AND pouring clearly begins before any steam is visible, AND the cup stays in place on the table the whole time (it is never lifted, tilted, or moved), AND no unrelated object or hand wanders into frame during the sequence.
level_5: Everything required for score 4, AND the cup reads unambiguously as an ordinary clear cylindrical drinking glass (not plastic, frosted, or colored), AND the water is poured cleanly into the cup with no splashing outside it, AND the rim and outer wall stay fully inside the frame the entire time, with no cropping, zooming, or panning that cuts off either one.

Scientific and Causal Correctness rubric:
level_1: No white steam plume appears at the rim at any point; or a plume appears before any water has been poured; or vapor is only visible inside the cup's interior air space and never rises above or around the rim.
level_2: A steam-like plume does appear, but it behaves in a way that contradicts how rising water vapor actually moves: e.g., it drifts downward, moves only sideways with no upward drift, appears more than 3 seconds after pouring has finished, or looks like thick gray/black smoke rather than a thin white mist.
level_3: A visibly white, mist-like plume rises from the rim of the cup, starting during the pour or within about a second after pouring stops; the plume moves generally upward, with some natural drifting or curling, rather than sideways or downward.
level_4: Everything required for score 3, AND the plume visibly originates specifically at the rim (not from the base of the cup or from a point in mid-air disconnected from the cup), AND the plume persists continuously for at least a couple of seconds before gradually thinning out, rather than switching on and off abruptly.
level_5: Everything required for score 4, AND the plume is consistently white or pale throughout (not tinted blue or yellow, and not looking like solid smoke), AND it rises and thins out smoothly and cohesively rather than in fragmented puffs, AND its onset visibly coincides with the hot water filling near the rim rather than appearing with an unexplained delay or before the pour begins.

Spatiotemporal Consistency rubric:
level_1: The cup suddenly jumps to a different position or size, or vanishes and reappears; the lighting flips abruptly between frames (e.g., a hard shadow appears or disappears with nothing to explain it); the cup's structure breaks apart (e.g., the rim disappears or the wall flickers between transparent and opaque); or the steam plume switches fully on or fully off with no visible transition at all.
level_2: The cup's rim flickers in and out of visibility across the sequence; the steam's onset looks like a series of separate jumps rather than a continuous emergence; the lighting shifts enough to cause the shadow on the table to jump or change shape inconsistently; or the glass wall's surface appears to update in visibly separate chunks (e.g., the upper part of the cup seems to lag behind the lower part).
level_3: The cup stays intact and stationary throughout, with no sudden repositioning or resizing; the lighting stays even enough that the cup's outline and the table shadow stay recognizable and consistent; and the steam plume fades in gradually rather than snapping on instantly.
level_4: Everything required for score 3, AND the steam maintains a continuous upward path without abruptly jumping sideways or splitting into disconnected fragments; AND the glass wall's surface looks stable from one moment to the next, with no visible warping, stretching, or shakiness in its outline; AND the steam is never clipped or hidden by the cup's wall: it stays visible above the rim throughout.
level_5: Everything required for score 4, AND the steam's upward drift looks smooth and continuous, with its density thinning out gradually rather than in sudden jumps; AND the cup's outline, the rim, and the steam plume all keep consistent, physically sensible spatial relationships to one another and to the table throughout the entire clip, with no visible warping, stutter, or misalignment at any point.