Domain: Engineering — Instrument and Meter Engineering
Target concept: Thermometer

Video generation prompt: Immerse the bulb of the glass liquid thermometer (range 0–100°C, division value 1°C) completely into a beaker containing room-temperature water. After standing still, slowly add boiling water to the beaker while keeping the camera fixed on the thermometer scale and liquid column throughout the process.

Evaluation guide:
(i) Target concept: Visual demonstration of thermal expansion-driven liquid column displacement in a calibrated glass thermometer under controlled heating.
Minimum mechanism: (a) Bulb must be fully surrounded by thermally conductive liquid to transfer heat to working fluid; (b) Working fluid (alcohol/mercury) must expand volumetrically upon heating; (c) Capillary constriction converts small volume change into large linear displacement; (d) Fixed viewpoint enables direct correlation between thermal input and column position.
(ii)Storyline: [Frame 0–2] Thermometer fully immersed, vertical, motionless in clear room-temp water; scale and full liquid column visible. [Frame 3–4] Boiling water stream enters beaker — visually distinct via steam, opacity, or turbulence. [Frame 5–6] Liquid column remains static until hot water contacts bulb’s surroundings. [Frame 7–8] Column begins smooth, continuous ascent along scale divisions. [Frame 9–10] Column continues rising without reversal, breakage, or occlusion; all elements remain spatially locked under fixed camera view.

Manual:
Experimental Procedure
1. Place glass liquid thermometer (0–100°C, 1°C division) vertically into beaker filled with room-temperature water until bulb is fully immersed.
2. Hold thermometer still until liquid column stabilizes.
3. While keeping camera fixed on thermometer scale and liquid column, slowly pour boiling water into beaker.
Observation of Experimental Phenomena
Liquid column rises continuously and smoothly along the scale as boiling water mixes with water surrounding the bulb.
Summary of Experimental Principles
Thermal expansion of liquid inside sealed glass capillary: temperature increase → volume increase → column rises proportionally to temperature change.

Prompt Grounding rubric:
level_1: No thermometer appears; no beaker appears; no water is visible; nothing is poured into the beaker; the camera does not hold steady on the thermometer's scale and liquid column at any point.
level_2: The thermometer appears but its bulb is not immersed in the water; the beaker is empty or holds something other than liquid; no hot water is ever added; the camera drifts away from the scale/liquid column at some point in the clip.
level_3: The thermometer's bulb is fully submerged in water inside the beaker from the start; the camera stays on the thermometer's scale and liquid column for the whole clip; hot water is added at some point, but at least one detail is off -- the hot water looks no different from the room-temperature water (no steam, no visible turbulence), or the bulb comes partly out of the water during the pour, or the pour starts before the thermometer has settled.
level_4: Everything required for score 3 is shown, in the right order: the thermometer's bulb sits fully submerged in room-temperature water at the start; the thermometer stays still before any hot water is added; hot water is then poured in while the camera stays fixed on the scale and liquid column; the hot water is visibly distinct as it enters -- through steam, a shimmer, or a visible disturbance in the water; only one small flaw is allowed, such as a brief glare on the meniscus or a moment of soft focus on the scale.
level_5: Everything required for score 4 holds with no flaws: the thermometer's bulb is fully submerged in clear room-temperature water from the first frame; the thermometer stays completely still for at least a second before the hot water is added; the hot water enters as a visibly distinct, continuous stream with steam or shimmer as it mixes in; the camera stays fixed on the scale and the full liquid column, from bulb to meniscus, without ever panning, zooming, or rotating; nothing ever blocks or blurs the scale markings or the liquid column.

Scientific and Causal Correctness rubric:
level_1: The liquid column does not rise while hot water is added; the column falls instead of rising; or the thermometer behaves impossibly -- the column rises before the hot water touches the surrounding water, drops as the water heats, or splits into two separate columns.
level_2: The column rises, but it starts moving before the hot water actually reaches the water around the bulb; or it rises in visible jumps or resets rather than smoothly; or it rises while the bulb is not fully submerged; or the column's color looks wrong for a liquid thermometer -- for instance colorless, or a color that shifts partway through the clip.
level_3: The column rises steadily and only after the hot water is visibly mixing with the water around the bulb; it stays in one unbroken line with no gaps, splits, or bubbles inside it; the bulb stays fully submerged the whole time the column is rising; the column keeps one consistent color throughout (for example, a steady red) rather than changing color mid-clip.
level_4: Everything required for score 3 holds: the rise begins only once hot water has reached and surrounded the bulb; the rise is smooth with no stutters, pauses, or reversals; the column stays unbroken inside the capillary; the column's color stays constant throughout; the bulb stays fully submerged the whole time; only one minor flaw is allowed, such as the rise looking a bit quicker than expected while still staying physically plausible.
level_5: Everything required for score 4 holds perfectly: the column stays put until the moment hot water first visibly touches the water around the bulb, then rises immediately and continuously with no delay; the column keeps a uniform thickness and a steady, unchanging color the entire time it rises; no air gaps, kinks, or breaks appear in the column; the bulb stays fully surrounded by liquid throughout; the column's rise looks proportional to the heating shown, with no overshoot, wobble, or premature stop.

Spatiotemporal Consistency rubric:
level_1: The thermometer or beaker vanishes and reappears; the liquid column jumps to a new position on the scale with nothing shown in between; the lighting suddenly changes with no connection to the hot water being poured; the thermometer's glass shows a crack or the scale detaches.
level_2: The camera pans, tilts, zooms, or rotates at any point; the thermometer changes position or tilt with no physical cause; the beaker changes shape; the water's surface moves in a way water wouldn't (for example, a wave that never dies down); the light or shadow on the thermometer changes abruptly with no matching change in the hot water pour or light source.
level_3: The thermometer stays upright and fixed in the beaker; the beaker stays put on its surface; the water level rises gradually and evenly as hot water is added; the camera holds one fixed view for the whole clip; small flaws are still acceptable, such as a single frame where the scale markings look slightly warped from refraction, or the column appearing to skip by one scale division for a moment.
level_4: Nothing teleports, nothing breaks, no lighting flashes, the camera never shifts, and no object changes shape; the water level rise looks smooth and continuous; the thermometer shows realistic refraction where the glass meets the air and the water; any steam or shimmer from the hot water develops naturally over at least 3 consecutive frames; at most one small flaw is allowed, such as a single frame of shimmer briefly and partially covering the column without hiding it.
level_5: Perfect spatial and temporal continuity throughout: the thermometer's position, tilt, and scale stay visibly fixed across the whole clip with no shift, rotation, or misalignment; the liquid column passes through every scale division on its way up rather than skipping any; the refraction at the glass-air and glass-water boundaries stays stable and consistent with the fixed camera and rising water level; the hot water's steam or shimmer develops and fades naturally; no frame shows flickering, ghosting, warping, or a sudden lighting change.