Domain: Natural Science — Atmospheric Science
Target concept: The balloon on the bottle expands in warm water and contracts in cold water (air expands...).

Video generation prompt: A transparent glass bottle, with a deflated balloon fitted over its mouth, is first placed in a red bowl containing warm water, and then transferred to a blue bowl containing cold water.

Evaluation guide:
(i) Target concept: Thermal expansion and contraction of trapped air governed by ideal gas law (V ∝ T at constant P,n).
Minimum mechanism: Air must be sealed inside bottle by balloon; temperature differential between bowls must be sufficient to drive measurable volume change; balloon must be elastic and responsive to internal pressure change; bottle must be rigid to prevent deformation masking air volume effect.
(ii)Storyline: [Start] Bottle upright, balloon fully deflated and snug on mouth, resting outside bowls. [Transition 1] Bottle lowered steadily into red bowl → water surrounds base → balloon begins expanding within ~1s of full immersion. [Stable 1] Balloon reaches maximally expanded state while fully immersed in red bowl. [Transition 2] Bottle lifted cleanly and transferred without tilting → balloon remains attached → enters blue bowl. [Transition 3] Balloon begins contracting within ~1s of full immersion in blue bowl. [Stable 2] Balloon returns to fully deflated state matching initial condition. Perspective: Fixed frontal view, full bottle and both bowls in frame; no occlusion of balloon mouth interface; lighting ensures balloon surface visibility throughout.

Manual:
Experimental Procedure
1. Place transparent glass bottle with deflated balloon tightly fitted over its mouth into red bowl containing warm water.
2. Observe balloon expansion.
3. Transfer same bottle directly into blue bowl containing cold water.
4. Observe balloon contraction.
Observation of Experimental Phenomena
Balloon expands visibly when bottle is in red (warm) bowl; balloon contracts visibly when bottle is in blue (cold) bowl.
Summary of Experimental Principles
Air inside bottle expands when heated (in warm water), increasing pressure and inflating balloon; air contracts when cooled (in cold water), decreasing pressure and deflating balloon.

Prompt Grounding rubric:
level_1: No transparent glass bottle present; no deflated balloon fitted over any bottle mouth; no red bowl containing warm water visible; no blue bowl containing cold water visible; no sequential placement of bottle into red bowl then blue bowl.
level_2: At least one of the four required objects is present (bottle, balloon, red bowl, blue bowl), but none are arranged or used in the required sequence; balloon is not fitted over bottle mouth; bowls lack identifiable water or color differentiation; placement action is absent or reversed.
level_3: Transparent glass bottle present with a deflated balloon correctly fitted over its mouth; red bowl and blue bowl both present and visually distinguishable by color; bottle is placed into red bowl first and then into blue bowl; correct sequential order of placement actions is visible and unambiguous.
level_4: All elements from score 3 are present and correctly ordered, AND balloon remains fully attached to bottle mouth throughout both placements (no detachment, slippage, or misfit); bowls contain visible liquid (water) filling at least half their depth; bottle orientation remains upright and stable during both placements.
level_5: All elements from score 4 are present, AND red bowl and blue bowl are side-by-side in same scene before/during/after transfers; bottle is fully visible in both bowls without occlusion; balloon state change (expansion/contraction) is not required for PG: only correct object presence, color, fitting, and sequential placement matters, and all visual attributes match posted_prompt exactly with zero deviation.

Scientific and Causal Correctness rubric:
level_1: No observable state change in balloon; balloon remains fully deflated or fully inflated throughout; no correlation between bowl placement and balloon shape; expansion appears in cold water or contraction appears in warm water.
level_2: Balloon shows shape change, but direction is inverted: expands in blue (cold) bowl or contracts in red (warm) bowl; or shape change occurs without bowl placement; or balloon inflates/deflates spontaneously without thermal contact.
level_3: Balloon visibly expands after placement in red bowl and visibly contracts after placement in blue bowl; expansion and contraction are each clearly associated with the corresponding bowl placement; no contradictory state transitions (e.g., expansion followed by further expansion in cold water).
level_4: All elements from score 3 are satisfied, AND balloon remains deflated at start (before red bowl), AND expansion is fully reversible (returns to near-original deflated state in blue bowl), AND no intermediate inflation/deflation unrelated to bowl contact.
level_5: All elements from score 4 are satisfied, AND balloon expansion is continuous and monotonic during red bowl immersion, AND contraction is continuous and monotonic during blue bowl immersion, AND no residual inflation after blue bowl exposure: balloon returns to identical pre-red-bowl deflated state, confirming thermal reversibility of air volume change.

Spatiotemporal Consistency rubric:
level_1: Severe spatiotemporal violation: bottle teleports between bowls; balloon detaches and reappears elsewhere; abrupt lighting shift or shadow discontinuity between frames; bottle or bowls flicker, warp, or disappear mid-sequence; motion is jerky or non-continuous with visible frame drops or cuts.
level_2: Moderate violations: bottle rotates >90° unexpectedly during transfer; balloon visibly stretches/squashes unnaturally (non-physical deformation); water surface exhibits impossible fluid behavior (e.g., rigid oscillation, inverted meniscus); background shifts or scales inconsistently between shots.
level_3: All objects maintain consistent spatial relationships: bottle remains upright and centered in each bowl; balloon stays fixed to bottle mouth without slipping; water level remains stable in each bowl during immersion; lighting and shadows remain coherent and stationary across entire sequence.
level_4: All elements from score 3 are satisfied, AND camera viewpoint is fixed (no pan/tilt/zoom); bottle moves smoothly and continuously from red to blue bowl (no jump cut or repositioning); water surface ripples naturally and settles within same scene; no structural distortion of glass bottle or balloon material.
level_5: All elements from score 4 are satisfied, AND motion parallax is physically consistent (e.g., bottle edges maintain sharp focus while background stays uniformly blurred if shallow DoF is used); inter-frame motion is smooth with no velocity discontinuity; no temporal aliasing (e.g., stroboscopic balloon movement); no lens flare, chromatic aberration, or sensor bloom inconsistent with lighting conditions.