Domain: Natural Science — Physics
Target concept: Candle burning in open air vs. candle burning under a glass jar

Video generation prompt: Place two identical candles side by side on a table and light them. Cover the right candle with a transparent glass jar, while the left candle remains exposed to the air.

Evaluation guide:
(i) Target concept: Oxygen-dependent combustion demonstrated via controlled isolation.
Minimum mechanism: Flame must be sustained only while gaseous oxidizer (oxygen in air) is freely available at the flame zone; enclosure must prevent replenishment without introducing confounding variables (e.g., heat retention, CO2 buildup visual effects).
(ii)Storyline: [Phase 1] Two lit candles coexist identically in open air → [Phase 2] Transparent jar is placed over right candle, fully enclosing flame → [Phase 3] Right flame undergoes progressive dimming and extinction due to O2 depletion; left flame persists unchanged → [Phase 4] Final state: right wick has extinguished flame (no glow, no smoke emission), left flame burns steadily. Perspective: Fixed frontal/slightly elevated view ensuring unambiguous left-right spatial labeling and full visibility of both flames and jar interior; no occlusion; lighting enables clear flame state discrimination.

Manual:
Experimental Procedure
1. Place two identical candles side-by-side on a flat table.
2. Light both candles simultaneously.
3. Cover the right candle with a transparent glass jar; leave left candle uncovered.
Observation of Experimental Phenomena
The right candle flame extinguishes after jar placement; the left candle flame remains lit continuously.
Summary of Experimental Principles
Combustion requires oxygen. The jar isolates the right candle from ambient air, depleting available oxygen and causing flame extinction. The uncovered left candle continues burning normally.

Prompt Grounding rubric:
level_1: Fewer than two candles appear, no glass jar appears at all, the candles are lit somewhere other than side by side on a table, or the jar (when present) is opaque rather than transparent.
level_2: Two candles sit side by side on the table and a transparent jar is present, but the jar covers the left candle instead of the right, the jar covers neither candle, or the jar covers both candles.
level_3: Two identical candles sit side by side on the table, both are lit, and a transparent jar is placed over the right candle only, leaving the left candle open to the air, matching the prompt's left/right assignment.
level_4: All of score 3, plus the jar fully encloses the right candle's flame with no part of the flame visible outside the jar's rim, the left candle's flame stays visible and unobstructed throughout, and no extra objects (hands, tools, labels) block the view of either candle after the jar is placed.
level_5: All of score 4, plus the two flames look the same size and shape when first lit, the jar's glass stays clear enough that the right flame inside it remains visible rather than hidden by glare or fogging, and the camera keeps one framing that shows both candles' left/right positions without needing a label to tell them apart.

Scientific and Causal Correctness rubric:
level_1: Neither candle is ever lit, both flames go out at the same time, the right (covered) candle's flame grows or stays steady after the jar is placed, or the left (uncovered) candle's flame goes out while the right one stays lit.
level_2: The right candle's flame goes out before the jar is fully placed over it, the left candle's flame also goes out at some point after the jar is placed on the right, or the right flame reacts to the jar with abnormal pulsing or color changes rather than fading toward extinction.
level_3: The right candle's flame is lit before the jar covers it and goes out only after the jar is fully seated over it; the left candle's flame stays lit and steady the whole time; the right flame goes out once, completely, with no relight.
level_4: All of score 3, plus the right flame does not go out until the jar has fully settled in place, not while it is still being lowered, the left flame shows no dimming, flicker, or movement caused by the jar being placed nearby, and no smoke appears from the right candle before its flame goes out.
level_5: All of score 4, plus the right flame visibly shrinks and dims gradually after the jar seals it in rather than cutting out abruptly, ending with no afterglow on the wick; the left flame's height and steadiness never change during the video; and once the right flame is out, it does not reignite or spark again.

Spatiotemporal Consistency rubric:
level_1: The jar appears already in place over the right candle with no placing motion shown, either flame blinks on or off with no transition, the tabletop visibly breaks or deforms, the shot cuts abruptly between different views of the candles, or the lighting or shadows on the table suddenly shift with no visible cause.
level_2: The jar's placement motion is broken into obvious separate jumps rather than one movement, a flame vanishes and reappears in a different spot or size, or the table's edge disappears and comes back.
level_3: Both candles stay in the same side-by-side spot throughout, the jar ends up centered over the right candle, and the flames stay anchored to their wicks; the jar's placement motion is a single visible downward movement rather than appearing already in place.
level_4: All of score 3, plus the jar's downward motion is smooth and one-directional (it does not stop, reverse, or overshoot before settling), the flames flicker naturally without freezing or dropping frames, and the wax and wick of each candle keep a stable shape rather than suddenly melting or drooping.
level_5: All of score 4, plus there is no visible frame skipping or repeating during the jar's placement, the flame edges stay sharp rather than smeared, and the jar's glass renders consistently clear so the left candle and the background stay visible through it without warping.