Domain: Engineering — Energy Engineering
Target concept: Comparison of Melting Rates of Ice on a Metal Plate and on a Wooden Surface

Video generation prompt: Under identical indoor conditions, identical ice blocks are placed side by side on bare metal and bare wood surfaces, with the camera kept fixed throughout the process.

Evaluation guide:
(i) Target concept: Differential melting rate driven by thermal conductivity contrast between metal and wood.
Minimum mechanism: Direct solid–solid contact between ice and surface; no external heating/cooling; ambient temperature >0°C; surfaces at thermal equilibrium with environment prior to ice placement; ice initially at 0°C.
(ii)Storyline: [t0] Two identical ice cubes placed simultaneously onto adjacent bare metal and bare wood surfaces in fixed-view frame → [t1] Melting initiates exclusively at bottom-contact interface of both cubes → [t2] Liquid water becomes visibly present under metal-placed cube before any liquid appears under wood-placed cube → [t3] Liquid pool under the metal-placed cube grows visibly wider over time; liquid under the wood-placed cube stays small and shallow by comparison → [t4] Solid portions of both cubes maintain vertical alignment and geometric coherence; no top-down collapse or asymmetric slumping → Perspective constraint: Fixed frontal view capturing full contact zone of both cubes; visibility constraint: No occlusion of bottom interfaces; lighting must allow clear discrimination of liquid presence and spread beneath each cube.

Manual:
Experimental Procedure
1. Place two identical opaque white ice cubes simultaneously and gently onto two adjacent bare surfaces: one polished metal plate, one unfinished wooden board.
2. Ensure both cubes rest fully on their respective surfaces with full bottom-face contact; position them side-by-side within a single fixed camera frame.
3. Begin recording; maintain absolute camera stillness for entire duration.
Observation of Experimental Phenomena
Liquid water appears earlier and spreads more widely beneath the ice cube on the metal surface than beneath the ice cube on the wooden surface. Both cubes remain intact above the melt interface; no splashing, cracking, or sudden phase disruption.
Summary of Experimental Principles
Metal has higher thermal conductivity than wood; under identical indoor conditions, it transfers ambient heat to the ice more rapidly, accelerating melting at the contact interface.

Prompt Grounding rubric:
level_1: No ice block is shown, or only one surface (metal or wood) appears while the other is missing, or the two setups are stacked or shown in separate shots rather than next to each other, or the camera visibly pans, zooms, or repositions during the video.
level_2: One of the two ice blocks is missing, or one of the two surfaces (metal or wood) is absent; the ice rests on a tray, cloth, or other object rather than directly on the bare metal or wood; the two setups are not shown adjacent within the same frame; the camera drifts or re-angles at any point.
level_3: Two ice blocks are visible, each resting directly on its own bare surface (one on the metal plate, one on the wooden board), positioned next to each other in a single continuous shot with a locked, unmoving camera.
level_4: Everything in the 3-point level holds, and in addition the two ice blocks look the same size, shape, and opacity at the start (no visible difference in form or texture suggesting one was already partly melted or made differently), the metal plate and wooden board are each a single flat continuous surface with no visible seams, cloth, or extra layer on top, and no hand, tool, or label enters the frame after recording begins.
level_5: Everything in the 4-point level holds, and in addition both ice blocks start as sharp-edged, fully solid, opaque white cubes with no melting or dripping visible in the very first frame; the metal surface reads as a uniform gray-silver metallic sheet and the wooden surface as a uniform tan-brown board with visible wood grain; no glare on the metal hides the contact zone and neither block casts a shadow over the other's contact area; the framing keeps both blocks equally sized and fully visible with an unobstructed view down to where each cube touches its surface.

Scientific and Causal Correctness rubric:
level_1: Neither ice block shows any melting, or an ice block instead shatters, vanishes, or turns into something other than liquid water, or the ice on wood melts faster or more than the ice on metal (contradicting metal's higher thermal conductivity), or liquid appears before either cube actually touches its surface.
level_2: Only one of the two ice blocks ever shows melting; or water appears first (or in greater amount) under the wood-placed cube instead of the metal-placed cube; or the melt liquid is visibly colored rather than clear; or a cube already appears to be melting before the video begins.
level_3: Both ice blocks visibly melt into clear liquid water; water first becomes visible under the metal-placed cube before it is visible under the wood-placed cube; melting begins at the bottom contact point of each cube rather than the top or sides; neither cube regrows solid ice or refreezes.
level_4: Everything in the 3-point level holds, and in addition the pool of water under the metal-placed cube stays visibly larger than the pool under the wood-placed cube for the remainder of the video, no water appears under the wood cube until water is already clearly visible under the metal cube, and both cubes keep a solid core sitting above the liquid rather than breaking apart or floating loose.
level_5: Everything in the 4-point level holds, and in addition the size gap between the two puddles (metal side clearly wider than wood side) keeps growing or stays clearly visible through to the end of the video, both remaining ice cores shrink smoothly rather than cracking or toppling over, and no frost, fog, or unrelated moisture appears on either surface.

Spatiotemporal Consistency rubric:
level_1: An ice cube or a surface appears to teleport (e.g., a cube is suddenly shown already sitting in a puddle with no melting shown getting there, or the metal plate's position jumps between frames); the room lighting suddenly switches (e.g., day to night) mid-video; the wood grain or metal sheen disappears and reappears; a whole cube vanishes and reappears at a different size.
level_2: A brief flash, dark frame, or visible cut interrupts the recording; a shadow flickers on only one of the two surfaces without explanation; one cube's outline warps or stretches for a moment; an edge of the table or a background object appears and disappears inconsistently; the camera shakes with a visible, repeating jitter.
level_3: No cube or surface teleports, no dark/flash frames or cuts occur, and the room lighting stays even from start to finish; both ice cubes and both surfaces keep the same shape, position, and orientation relative to each other; shadows cast by the cubes stay in the same place relative to each cube; the background behind the setup does not change.
level_4: Everything in the 3-point level holds, and in addition neither cube's outline nor either surface's edge stretches or warps between frames, the relative sizes of the two cubes and surfaces stay consistent with no hidden camera zoom, the metal plate's reflectiveness looks the same throughout rather than mirror-like in some frames and dull in others, and no melted water re-freezes back into solid ice.
level_5: Everything in the 4-point level holds, and in addition the melting front on each cube advances smoothly frame to frame with no sudden jumps in puddle size, no flicker or popping appears on the metal sheen or wood grain texture, and the relative sharpness and perspective of the two setups stay consistent throughout the video with no unexplained depth or focus change.