Domain: Natural Science — Atmospheric Science
Target concept: Cloud in a Bottle: Condensation Caused by Pressure Release

Video generation prompt: A sealed, transparent plastic bottle with a small pool of water at its base and clear air inside is squeezed firmly by hand and then suddenly released.

Evaluation guide:
(i) Target concept: Adiabatic cooling-driven condensation via rapid pressure release in saturated air.
Minimum mechanism: Air inside the sealed bottle must already be saturated with water vapor before squeezing; squeezing must compress and slightly warm this air without producing visible condensation; the instantaneous release must cause rapid expansion and cooling of the air, driving it past saturation (supersaturation) so that water vapor condenses onto ambient dust and aerosol particles naturally present in the air (heterogeneous nucleation), forming visible liquid droplets.
(ii)Storyline: [Frame 0–2s] Bottle stationary, capped, interior air appears clear with a small pool of water visible at the base → [Frame 2–3s] Hands approach and make contact with the bottle → [Frame 3–4s] Bottle walls visibly buckle inward symmetrically → [Frame 4s] Release begins → [Frame 4–4.5s] White cloud appears centrally within the bottle volume, expanding radially → [Frame 4.5–7s] Cloud maintains defined boundaries and uniform density → [Frame 7–10s] Cloud gradually fades without splitting or streaking; bottle remains fully visible in fixed side-view throughout.

Manual:
Experimental Procedure
1. Fill a transparent plastic bottle with ~10 mL water, cap tightly.
2. Shake gently for 2 seconds to saturate air with water vapor.
3. Squeeze bottle firmly until walls visibly buckle inward.
4. Hold squeeze for <1 second, then release instantly.
Observation of Experimental Phenomena
A white, translucent cloud forms inside the bottle immediately upon release and dissipates within ~5 seconds. No cloud forms during squeezing or before release.
Summary of Experimental Principles
Rapid adiabatic expansion cools the saturated air inside the bottle below its dew point. The resulting supersaturated water vapor condenses onto ambient dust and aerosol particles naturally present in the air (heterogeneous nucleation), forming the microscopic liquid droplets seen as a visible cloud.

Prompt Grounding rubric:
level_1: No transparent plastic bottle appears in frame; no water is visible inside the bottle; no squeezing of the bottle walls is shown; no subsequent release is shown; the bottle is never shown capped/sealed.
level_2: A transparent plastic bottle is present and appears capped, but no water is visible inside it; the squeezing action is missing or is performed on an object other than this bottle; the release action is missing or occurs without a preceding squeeze on the same bottle.
level_3: A transparent, capped plastic bottle is shown with a small pool of water visible at its base; the bottle's interior air appears clear (no mist or fog) before squeezing; the bottle is squeezed by hand (visible inward deformation of the side walls) and then released (walls visibly move back toward their original shape); squeeze and release happen to the same bottle in one continuous shot.
level_4: All elements of 3-score are present, and additionally: the bottle stays in the same position throughout the shot; the hand does not fully block the view of the bottle's interior during squeezing or release; the water pool at the base stays visible and undisturbed up until the squeeze begins; no object other than the hand and bottle enters the frame.
level_5: All elements of 4-score are present, and additionally: the bottle is centered with its full side profile visible in every frame; squeezing produces a symmetric inward buckling of both side walls without any crease or kink; release lets the bottle walls spring back smoothly to their original rounded shape; no finger or hand ever covers the transparent body of the bottle where the water and any resulting cloud would be visible.

Scientific and Causal Correctness rubric:
level_1: No visible change occurs inside the bottle; the interior stays clear and unchanged before, during, and after the release; there is no visible link between the squeeze/release action and any change inside the bottle.
level_2: A cloud or mist appears inside the bottle, but not tied correctly to the release — for example it appears while the bottle is still being squeezed, appears well before the squeeze, or only shows up after a long unexplained delay; or the cloud appears outside the bottle rather than inside it; or the cloud is a color other than white/translucent (e.g., gray, blue, or black).
level_3: A white, translucent cloud appears inside the bottle right at the moment of release; the cloud stays fully contained within the bottle's interior; the cloud only appears after release, not during the squeeze or beforehand; the cloud fades out gradually within the video; the cloud is a clearly new, dense formation compared to the clear interior seen before squeezing.
level_4: All elements of 3-score are present, and additionally: the cloud forms in the upper-to-middle portion of the bottle's interior rather than being confined only to the cap or the base; the cloud's density looks even across its visible extent; only one cloud forms (no separate patches elsewhere in the bottle); the cloud's appearance is not accompanied by bubbling, splashing, or liquid being ejected from the water pool.
level_5: All elements of 4-score are present, and additionally: the cloud becomes visible in the same frame the bottle walls begin to spring back outward; the cloud expands outward from the center of the bottle's interior; the cloud keeps a clearly defined edge against the surrounding clear air while it persists; the cloud has fully faded away by around 9-10s into the video (roughly 5-6s after release), matching a gradual fade rather than an instant disappearance; the cloud never leaves a wet film or streak on the inner walls.

Spatiotemporal Consistency rubric:
level_1: The bottle vanishes and reappears between frames, or jumps to a different position/orientation without any continuous motion; the squeeze and the release appear to be from two different shots with mismatched lighting or background; the bottle deforms in physically impossible ways (e.g., folds like paper, stretches like rubber, or shatters) rather than showing elastic plastic deformation.
level_2: The bottle stays in frame but its scale or rotation jumps abruptly between the squeeze and the release; the hand's motion jumps from one position to another with no visible path in between; the shadow cast by the bottle disappears in one frame and reappears differently in a later frame with no gradual change; the cloud or interior mist blinks on and off between frames instead of building up or fading gradually.
level_3: The bottle stays fixed in position and orientation for the whole sequence; the hand's motion is continuous and physically plausible (approach, contact, squeeze, release, withdrawal); the bottle's interior changes smoothly with no instant jump from clear to cloudy or cloudy to clear between adjacent frames; the cloud forms and fades through a gradual change in opacity; the bottle shows only elastic buckling and recovery, with no tearing or permanent creasing.
level_4: All elements of 3-score are present, and additionally: the hand enters the frame before it first touches the bottle and exits the frame after the release is complete; the inward buckling of the bottle walls is symmetric and proportional on both sides; the cloud's opacity rises and then falls in one smooth arc, without pulsing or reversing partway through; there is no visible tearing, warping, or strobing/ghosting of the bottle or hand across frames.
level_5: All elements of 4-score are present, and additionally: the bottle keeps the same camera angle and apparent size across every frame, with no drift or zoom; the hand follows one unbroken, steady path through the squeeze and release with no sudden speed changes; the cloud's expansion and fading each proceed at a visually even pace; the bottle's interior and shadow show no visible flicker, jitter, or sudden brightness flashes at any point in the video.