Domain: Natural Science — Atmospheric Science
Target concept: Clockwise circular circulation formed by smog under temperature gradients

Video generation prompt: A beaker containing hot water is placed in the upper left corner of a transparent sealed glass chamber, while a beaker containing ice water is placed in the lower right corner. Cigarette smoke is slowly released from the central position of the chamber, and the smoke plume is continuously recorded.

Evaluation guide:
(i) Target concept: Thermally driven convective circulation in a confined, stably stratified fluid medium.
Minimum mechanism: Warm fluid must be less dense and rise; cold fluid must be more dense and sink; horizontal pressure/temperature gradients must exist to link vertical motions into a closed loop; gravity and chamber boundaries must constrain flow into planar circulation; smoke must act as passive tracer with inertia negligible compared to fluid motion.
(ii)Storyline: [Phase 1: Setup] Chamber stationary, two beakers fixed at diagonally opposite corners (hot-water beaker at upper-left, ice-water beaker at lower-right) with thermal signatures visible (steam + condensation). [Phase 2: Initiation] Smoke emerges centrally as a cohesive plume with no initial directionality. [Phase 3: Differentiation] Plume splits: the portion nearer the hot beaker accelerates upward; the portion nearer the cold beaker accelerates downward. [Phase 4: Connection] The rising limb curves rightward along the ceiling toward the cold side; the sinking limb curves leftward along the floor back toward the hot side; the horizontal limbs meet to close the loop. [Phase 5: Sustained Circulation] The closed loop, clockwise as seen from the fixed front-facing camera, persists with stable morphology, no stagnation or reversal. Perspective: Front-facing fixed camera, full-chamber framing, no occlusion, consistent focal plane covering all four quadrants.

Manual:
Experimental Procedure
1. Place a transparent sealed glass chamber on a stable surface.
2. Position a beaker with hot water in the upper-left corner; position a beaker with ice water in the lower-right corner.
3. Release cigarette smoke slowly from the exact center of the chamber interior.
4. Record continuously for 10 seconds.
Observation of Experimental Phenomena
Smoke forms a continuous, closed clockwise circular plume: rising near the hot-water beaker (upper-left), moving rightward across the top, descending near the ice-water beaker (lower-right), and moving leftward across the bottom.
Summary of Experimental Principles
Clockwise circular circulation forms due to temperature-gradient-driven convection: warm air (carrying smoke) rises above the hot beaker, moves horizontally across the top toward the cold side, cools and becomes denser, sinks near the cold beaker, then flows back along the bottom toward the hot beaker and rises again — completing a thermally sustained clockwise loop under Earth's gravity and chamber confinement.

Prompt Grounding rubric:
level_1: No beaker is shown at all, or neither the ice-water beaker nor the hot-water beaker appears; the transparent sealed chamber is missing; no cigarette smoke is released; there is no identifiable release point at the chamber's center; the two beakers are not placed near the upper-left and lower-right corners.
level_2: At least one beaker is present, but both the ice-water and hot-water beakers are missing or impossible to tell apart (e.g., both look cold, or both look hot); the chamber is opaque, open, or absent; smoke is missing or released from an edge or corner rather than the center; or the beakers' corners are swapped or otherwise unclear (e.g., both appear in the same corner, or their identities can't be told apart from position alone).
level_3: The transparent sealed chamber is present; the two beakers appear roughly in the correct corners, one near the upper-left, one near the lower-right; smoke is released from a central point inside the chamber; at least one beaker shows a visible thermal cue (condensation on the cold one, or visible steam/vapor on the hot one), though the hot/cold identity of both beakers together isn't yet fully confirmed by visual cues.
level_4: Everything at the 3-point level holds, and in addition both beakers are clearly and correctly identified: the beaker near the upper-left corner shows a continuous rising wisp of steam or vapor (hot water), and the beaker near the lower-right corner shows visible condensation, frost, or mist on its exterior (ice water); the smoke is released from the geometric center of the chamber; the upper-left/lower-right placement is clearly readable against the fixed chamber frame; nothing is mislabeled or swapped.
level_5: Everything at the 4-point level holds, and in addition both beakers already show their thermal signatures (steam on the hot one, condensation on the cold one) continuously before and during the smoke release, the smoke release begins right at the chamber's center with no delay or repositioning after setup, and every object holds its position throughout the full recording with no drift, zoom, or rotation of the camera.

Scientific and Causal Correctness rubric:
level_1: Smoke moves randomly or spreads evenly in every direction with no directional bias; it stays put with no motion; it disperses without ever showing any link to the temperature difference between the two beakers; or it shows no circulation pattern of any kind.
level_2: Smoke shows some drift in one direction, but never closes into a loop or circular path; it does not visibly separate into a rising layer near one beaker and a sinking layer near the other; there's no visible contrast between the upper and lower parts of the chamber; nothing suggests the motion is driven by the temperature difference.
level_3: Smoke visibly rises near the upper-left hot beaker and sinks near the lower-right cold beaker; a weak horizontal connection between the rising and sinking parts is visible, but the loop is incomplete or breaks somewhere along the way (e.g., a gap in the plume, or the motion stopping abruptly) rather than forming a fully closed path.
level_4: Smoke forms one continuous, closed loop: it rises near the upper-left hot beaker, moves rightward along the ceiling, descends near the lower-right cold beaker, and moves leftward along the floor back toward the hot beaker, with no break anywhere in the plume; the direction of travel is unambiguously clockwise as seen from the fixed front-facing camera; the rising portion of smoke stays near the visible steam from the hot beaker, and the sinking portion stays near the visible condensation on the cold beaker.
level_5: Everything at the 4-point level holds, and in addition this clockwise loop stays stable for at least about 80% of the recording's duration, without reversing direction, stalling, or splitting into a competing counter-loop; the smoke's density and visibility stay fairly even across all four quadrants of the chamber, and the rising and sinking portions of the loop stay roughly matched in thickness and opacity as they move.

Spatiotemporal Consistency rubric:
level_1: The hot-water or ice-water beaker appears to jump to a different position between frames instead of staying fixed in its corner; the chamber's shape or size changes; smoke appears or vanishes instantly with no visible origin or fade; the scene's lighting swings violently or changes color cast abruptly between frames; or shadows on the beakers and chamber appear, vanish, or point in different directions with no matching camera movement.
level_2: A beaker's position shifts by more than a tenth of the chamber's width between key moments; the smoke plume breaks up or jumps abruptly by more than a quarter of the chamber's height between frames; the overall brightness of the scene changes by more than half from one frame to the next; or a highlight or shadow on a beaker swings from one side to the other with no camera movement to explain it.
level_3: Both beakers stay within about five percent of their starting position in the chamber over the whole video; the smoke plume moves along its path continuously with no jumps or gaps; the chamber shows only slight, gradual brightness changes rather than any pulsing; and the light falling on the hot-water and ice-water beakers keeps roughly the same direction throughout, with only minor softening or sharpening of their shadows. Nothing swings to a new angle.
level_4: Everything at the 3-point level holds, and in addition the corners of each beaker line up with the same chamber corners throughout, with no measurable drift, resizing, or rotation of either beaker; the lighting across the whole chamber stays even, without any pulsing, gradient shift, or moving hotspot; shadows keep a fixed angle and sharpness rather than gradually softening or sharpening; and nothing in the frame tears, warps, or gets unexpectedly hidden.
level_5: Everything at the 4-point level holds, and in addition the smoke's motion looks perfectly smooth: no sudden speed-ups, stutters, or repeated frames; the chamber's structure in the background shows no small wobble or drift; and every edge in the scene (beaker rims, chamber walls, smoke boundary) stays crisp and steady rather than blurring or flickering from frame to frame.