Domain: Engineering — Instrument and Meter Engineering
Target concept: Thermocouple Temperature Measurement

Video generation prompt: Set up a thermocouple temperature measurement device, fix the measuring end of the K-type thermocouple at the center of the electric heating stage, and place the reference end in a 0°C ice-water bath. Connect the two ends of the thermocouple to a pointer-type temperature indicator, activate the heating stage, and align the camera with the pointer of the temperature indicator and the heating stage.

Evaluation guide:
(i) Target concept: Thermoelectric temperature measurement using cold-junction compensation.
Minimum mechanism: Two dissimilar metals (chromel/alumel) generate voltage when junctions are at different temperatures; reference junction must be held at known fixed temperature (0°C) for absolute measurement; analog indicator must translate millivolt signal into calibrated temperature scale.
(ii)Storyline: [Frame 0–2] Static setup: thermocouple wires placed, measuring end centered on stage, reference end submerged in ice-water bath, wires connected to indicator dial; [Frame 3–4] Activation trigger: heating stage power engaged → visible glow begins at stage surface; [Frame 5–8] Causal response: pointer begins smooth upward deflection only after glow appears; ice-water bath remains stable with coexisting phases; [Frame 9–10] Steady-state observation: pointer stabilizes at elevated value while stage glow persists and bath unchanged; camera maintains fixed viewpoint showing both stage center and pointer tip simultaneously.

Manual:
Experimental Procedure
1. Fix K-type thermocouple measuring end (yellow/red wires twisted) at center of electric heating stage surface.
2. Submerge thermocouple reference end wires in ice-water bath (visible ice + liquid water).
3. Connect thermocouple wires to terminals of pointer-type temperature indicator.
4. Activate heating stage; align camera to capture both heating stage center and indicator pointer in same frame.
Observation of Experimental Phenomena
- Pointer deflects upward continuously after heating starts.
- Ice-water bath maintains visible solid-liquid coexistence throughout.
- Thermocouple wires remain taut and color-coded from junction to indicator.
Summary of Experimental Principles
K-type thermocouple generates Seebeck voltage proportional to temperature difference between measuring end (heated) and reference end (0°C ice bath); pointer indicator converts voltage to analog temperature reading.

Prompt Grounding rubric:
level_1: None of the four required components are visible together: no K-type thermocouple, no electric heating stage, no ice-water bath, and no pointer-type analog temperature indicator appear at any point in the video.
level_2: At least one of the four components appears (e.g., a generic rod stands in for the thermocouple, or a plain dial with no needle), but the required pairings are missing: the thermocouple is not shown wired to the indicator, the heating stage is absent, the ice-water bath is absent, or the indicator's pointer is never framed together with the heating stage.
level_3: All four components are present and correctly paired: a K-type thermocouple with two visually distinguishable wire leads (twisted or joined into a single measuring junction), an electric heating stage (a flat, circular or plate-like surface with a heating element, cold or glowing), an ice-water bath (a transparent container holding visible ice cubes floating in liquid water), and a pointer-type analog indicator (a dial face with a mechanical needle). The thermocouple's two leads are connected to the indicator's terminals, and the camera frames the heating-stage center and the indicator's pointer together in the same shot.
level_4: Everything required at level 3 holds, and in addition, the thermocouple's measuring junction sits at the geometric center of the heating-stage surface with no wire trailing off to one side, the reference-end leads are fully submerged in the ice-water bath with no bare wire exposed above the ice or water line, and the indicator's pointer is unobstructed, in sharp focus, and free of rapid back-and-forth jitter throughout the observation window.
level_5: Everything required at level 4 holds, and in addition, the thermocouple's two leads keep their individual color or texture identity unchanged all the way from the heating-stage junction to the indicator terminals, with no crossing or swapping of the two conductors visible at any point; the indicator's dial numerals and scale markings stay legible (not washed out by glare or blocked by camera angle) for the full duration; and the entire scene stays within a single fixed frame with no pan, tilt, or zoom.

Scientific and Causal Correctness rubric:
level_1: The thermocouple is shown wired into a digital multimeter or other non-analog display instead of the pointer-type indicator; the heating stage stays visibly cold (no glow, no heat shimmer) while the pointer nonetheless reads a high temperature; the ice-water bath is missing or replaced by plain room-temperature water; or the pointer moves before the heating stage is ever activated.
level_2: The two thermocouple leads are shown swapped at the indicator terminals relative to their connection at the measuring junction; the pointer deflects downward as the stage heats up; the ice-water bath contains only liquid water or only ice with no coexistence of the two phases; the heating stage glows visibly red-hot while the pointer reads below 50°C; or the pointer's motion precedes the heating stage's activation instead of following it.
level_3: After the heating stage is activated, the pointer deflects upward, indicating an increasing temperature reading; the ice-water bath shows both solid ice and liquid water present at once; the thermocouple's two leads run from the heating-stage junction to the indicator terminals with no sign of reversed wiring; and the direction of pointer motion is consistent with the correct thermoelectric sign convention for a K-type thermocouple (a junction hotter than the ice-bath reference produces a reading above 0°C, not below).
level_4: Everything required at level 3 holds, and in addition, the pointer's upward deflection during heating is continuous and monotonic, with no backward jump or sudden reset to a lower value; the ice-water bath shows no sign of rapid boiling or sudden complete melting during the observation window; and the thermocouple's measuring junction stays in unbroken contact with the heating-stage surface, never lifting, floating free, or separating from it.
level_5: Everything required at level 4 holds, and in addition, the pointer's reading stays physically plausible for a K-type thermocouple against a 0°C ice-bath reference: once the heating-stage surface shows a first, dull-red glow, the pointer must already read on the order of several hundred degrees Celsius (roughly 500-600°C, consistent with the Draper-point threshold for visible dull-red incandescence), and if the glow brightens further toward a cherry-red or brighter tone, the reading must climb correspondingly higher (into the 700-800°C range or beyond) rather than staying flat or dropping — the pointer must never sit at a low reading such as 50°C while the stage is visibly glowing. The thermocouple's junction at the heating stage also shows no exposed bare wire or insulation breach at the hot junction.

Spatiotemporal Consistency rubric:
level_1: The thermocouple appears already fully wired and in place mid-video with no placement action ever shown; the heating stage flickers in and out of the frame; the pointer jumps discontinuously between unrelated readings with no smooth sweep between them; or the ice-water bath's volume or ice/water ratio changes abruptly between adjacent frames with no gradual transition.
level_2: The thermocouple's wire connections visibly disconnect and reconnect without any on-screen cause; the pointer disappears behind some occluding object and reappears afterward at a different angle on the dial; the heating-stage surface warps, bends, or rotates in ways a rigid metal plate cannot; or the ice-water bath's container itself shifts position or changes shape on the bench.
level_3: The thermocouple's two leads form one continuous, unbroken path from the heating-stage junction to the indicator terminals throughout; the ice-water bath stays in the same place on the bench relative to the indicator; the heating-stage center and the indicator's pointer remain framed together in the same shot for the whole duration; and none of the four components (thermocouple, heating stage, ice-water bath, indicator) blinks out of the frame, jumps to a new position, or gets replaced by a different-looking object mid-video.
level_4: Everything required at level 3 holds, and in addition, the thermocouple's wire leads keep a consistent, natural routing with no sudden kinking, snapping, or unnatural bending; the pointer's motion across the dial is a smooth, continuous sweep with no stutter, freeze-frame jump, or instantaneous repositioning; and the heating-stage surface stays rigid and flat, never warping, bubbling, or behaving like a fluid.
level_5: Everything required at level 4 holds, and in addition, the visual distance between the pointer tip and the heating-stage center stays constant given the fixed camera framing, with neither object appearing to shrink or grow relative to the other; if the ice cubes in the bath are shown shrinking or melting, that change unfolds gradually across the sequence rather than an ice cube vanishing or changing shape between one frame and the next; and the pointer's motion is confined to a rotational arc around its fixed pivot on the dial, never translating in a straight line across the dial face.